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The American College of Cardiology on Feb. 13, 2020, released a clinical bulletin that aims to address cardiac implications of the current epidemic of the novel coronavirus, now known as COVID-19.

The bulletin, reviewed and approved by the college’s Science and Quality Oversight Committee, “provides background on the epidemic, which was first reported in late December 2019, and looks at early cardiac implications from case reports,” the ACC noted in a press release. “It also provides information on the potential cardiac implications from analog viral respiratory pandemics and offers early clinical guidance given current COVID-19 uncertainty.”

The document looks at some early cardiac implications of the infection. For example, early case reports suggest patients with underlying conditions are at higher risk of complications or mortality from the virus, with up to 50% of hospitalized patients having a chronic medical illness, the authors wrote.

About 40% of hospitalized patients confirmed to have the virus have cardiovascular or cerebrovascular disease, they noted.

In a recent case report on 138 hospitalized COVID-19 patients, they noted, 19.6% developed acute respiratory distress syndrome, 16.7% developed arrhythmia, 8.7% developed shock, 7.2% developed acute cardiac injury, and 3.6% developed acute kidney injury. “Rates of complication were universally higher for ICU patients,” they wrote.

“The first reported death was a 61-year-old male, with a long history of smoking, who succumbed to acute respiratory distress, heart failure, and cardiac arrest,” the document noted. “Early, unpublished first-hand reports suggest at least some patients develop myocarditis.”

Stressing the current uncertainty about the virus, the bulletin provides the following clinical guidance:

• COVID-19 is spread through droplets and can live for substantial periods outside the body; containment and prevention using standard public health and personal strategies for preventing the spread of communicable disease remains the priority.
• In geographies with active COVID-19 transmission (mainly China), it is reasonable to advise patients with underlying cardiovascular disease of the potential increased risk and to encourage additional, reasonable precautions.
• Older adults are less likely to present with fever, thus close assessment for other symptoms such as cough or shortness of breath is warranted.
• Some experts have suggested that the rigorous use of guideline-directed, plaque-stabilizing agents could offer additional protection to cardiovascular disease (CVD) patients during a widespread outbreak (statins, beta-blockers, ACE inhibitors, acetylsalicylic acid); however, such therapies should be tailored to individual patients.
• It is important for patients with CVD to remain current with vaccinations, including the pneumococcal vaccine, given the increased risk of secondary bacterial infection; it would also be prudent to receive vaccination to prevent another source of fever which could be initially confused with coronavirus infection.
• It may be reasonable to triage COVID-19 patients according to the presence of underlying cardiovascular, respiratory, renal, and other chronic diseases for prioritized treatment.
• Providers are cautioned that classic symptoms and presentation of acute MI may be overshadowed in the context of coronavirus, resulting in underdiagnosis.
• For CVD patients in geographies without widespread COVID-19, emphasis should remain on the threat from influenza, the importance of vaccination and frequent handwashing, and continued adherence to all guideline-directed therapy for underlying chronic conditions.
• COVID-19 is a fast-moving epidemic with an uncertain clinical profile; providers should be prepared for guidance to shift as more information becomes available.

The full clinical update is available here.

This article first appeared on Medscape.com.

The American College of Cardiology on Feb. 13, 2020, released a clinical bulletin that aims to address cardiac implications of the current epidemic of the novel coronavirus, now known as COVID-19.

The bulletin, reviewed and approved by the college’s Science and Quality Oversight Committee, “provides background on the epidemic, which was first reported in late December 2019, and looks at early cardiac implications from case reports,” the ACC noted in a press release. “It also provides information on the potential cardiac implications from analog viral respiratory pandemics and offers early clinical guidance given current COVID-19 uncertainty.”

The document looks at some early cardiac implications of the infection. For example, early case reports suggest patients with underlying conditions are at higher risk of complications or mortality from the virus, with up to 50% of hospitalized patients having a chronic medical illness, the authors wrote.

About 40% of hospitalized patients confirmed to have the virus have cardiovascular or cerebrovascular disease, they noted.

In a recent case report on 138 hospitalized COVID-19 patients, they noted, 19.6% developed acute respiratory distress syndrome, 16.7% developed arrhythmia, 8.7% developed shock, 7.2% developed acute cardiac injury, and 3.6% developed acute kidney injury. “Rates of complication were universally higher for ICU patients,” they wrote.

“The first reported death was a 61-year-old male, with a long history of smoking, who succumbed to acute respiratory distress, heart failure, and cardiac arrest,” the document noted. “Early, unpublished first-hand reports suggest at least some patients develop myocarditis.”

Stressing the current uncertainty about the virus, the bulletin provides the following clinical guidance:

• COVID-19 is spread through droplets and can live for substantial periods outside the body; containment and prevention using standard public health and personal strategies for preventing the spread of communicable disease remains the priority.
• In geographies with active COVID-19 transmission (mainly China), it is reasonable to advise patients with underlying cardiovascular disease of the potential increased risk and to encourage additional, reasonable precautions.
• Older adults are less likely to present with fever, thus close assessment for other symptoms such as cough or shortness of breath is warranted.
• Some experts have suggested that the rigorous use of guideline-directed, plaque-stabilizing agents could offer additional protection to cardiovascular disease (CVD) patients during a widespread outbreak (statins, beta-blockers, ACE inhibitors, acetylsalicylic acid); however, such therapies should be tailored to individual patients.
• It is important for patients with CVD to remain current with vaccinations, including the pneumococcal vaccine, given the increased risk of secondary bacterial infection; it would also be prudent to receive vaccination to prevent another source of fever which could be initially confused with coronavirus infection.
• It may be reasonable to triage COVID-19 patients according to the presence of underlying cardiovascular, respiratory, renal, and other chronic diseases for prioritized treatment.
• Providers are cautioned that classic symptoms and presentation of acute MI may be overshadowed in the context of coronavirus, resulting in underdiagnosis.
• For CVD patients in geographies without widespread COVID-19, emphasis should remain on the threat from influenza, the importance of vaccination and frequent handwashing, and continued adherence to all guideline-directed therapy for underlying chronic conditions.
• COVID-19 is a fast-moving epidemic with an uncertain clinical profile; providers should be prepared for guidance to shift as more information becomes available.

The full clinical update is available here.

This article first appeared on Medscape.com.

The American College of Cardiology on Feb. 13, 2020, released a clinical bulletin that aims to address cardiac implications of the current epidemic of the novel coronavirus, now known as COVID-19.

The bulletin, reviewed and approved by the college’s Science and Quality Oversight Committee, “provides background on the epidemic, which was first reported in late December 2019, and looks at early cardiac implications from case reports,” the ACC noted in a press release. “It also provides information on the potential cardiac implications from analog viral respiratory pandemics and offers early clinical guidance given current COVID-19 uncertainty.”

The document looks at some early cardiac implications of the infection. For example, early case reports suggest patients with underlying conditions are at higher risk of complications or mortality from the virus, with up to 50% of hospitalized patients having a chronic medical illness, the authors wrote.

About 40% of hospitalized patients confirmed to have the virus have cardiovascular or cerebrovascular disease, they noted.

In a recent case report on 138 hospitalized COVID-19 patients, they noted, 19.6% developed acute respiratory distress syndrome, 16.7% developed arrhythmia, 8.7% developed shock, 7.2% developed acute cardiac injury, and 3.6% developed acute kidney injury. “Rates of complication were universally higher for ICU patients,” they wrote.

“The first reported death was a 61-year-old male, with a long history of smoking, who succumbed to acute respiratory distress, heart failure, and cardiac arrest,” the document noted. “Early, unpublished first-hand reports suggest at least some patients develop myocarditis.”

Stressing the current uncertainty about the virus, the bulletin provides the following clinical guidance:

• COVID-19 is spread through droplets and can live for substantial periods outside the body; containment and prevention using standard public health and personal strategies for preventing the spread of communicable disease remains the priority.
• In geographies with active COVID-19 transmission (mainly China), it is reasonable to advise patients with underlying cardiovascular disease of the potential increased risk and to encourage additional, reasonable precautions.
• Older adults are less likely to present with fever, thus close assessment for other symptoms such as cough or shortness of breath is warranted.
• Some experts have suggested that the rigorous use of guideline-directed, plaque-stabilizing agents could offer additional protection to cardiovascular disease (CVD) patients during a widespread outbreak (statins, beta-blockers, ACE inhibitors, acetylsalicylic acid); however, such therapies should be tailored to individual patients.
• It is important for patients with CVD to remain current with vaccinations, including the pneumococcal vaccine, given the increased risk of secondary bacterial infection; it would also be prudent to receive vaccination to prevent another source of fever which could be initially confused with coronavirus infection.
• It may be reasonable to triage COVID-19 patients according to the presence of underlying cardiovascular, respiratory, renal, and other chronic diseases for prioritized treatment.
• Providers are cautioned that classic symptoms and presentation of acute MI may be overshadowed in the context of coronavirus, resulting in underdiagnosis.
• For CVD patients in geographies without widespread COVID-19, emphasis should remain on the threat from influenza, the importance of vaccination and frequent handwashing, and continued adherence to all guideline-directed therapy for underlying chronic conditions.
• COVID-19 is a fast-moving epidemic with an uncertain clinical profile; providers should be prepared for guidance to shift as more information becomes available.

The full clinical update is available here.

This article first appeared on Medscape.com.

The standard intradermal route of delivery for Bacille Calmette–Guérin (BCG) does not necessarily generate a strong enough response from lung T-cells, the researchers say. They hypothesized that administering BCG by IV or aerosol might be more effective.

They gave a group of rhesus macaques the BGC vaccine by intradermal, aerosol, or IV routes, then assessed immune responses in blood and fluid drawn from the lungs over a 24-week follow-up. Six months after vaccination, the researchers injected the vaccinated animals with a virulent strain of Mycobacterium tuberculosis (M tuberculosis) and tracked infection and disease development over 3 months.

The IV vaccination resulted in the highest durable levels of T-cells in blood and lungs. Nine of 10 animals vaccinated via IV were highly protected; 6 showed no detectable infection in any tissue tested and 3 had only very low counts of M tuberculosis in lung tissue. All unvaccinated animals and those immunized via intradermal or aerosol routes showed signs of significantly greater infection.

Upping the dose did not improve protection. The IV BCG group showed 90% protection at a threshold as low as 50 colony-forming units (the standard human ID dose is 5 x 10⁵ CFUs).

The researchers say several unique quantitative and qualitative differences in the immune responses may underlie protection. Perhaps most noteworthy, they say, was the large population of T- cells in the tissue across all lung parenchyma lobes.

The study provides a “paradigm shift,” the researchers conclude, adding that the IV route may also improve the protective capacity of other vaccines.

The standard intradermal route of delivery for Bacille Calmette–Guérin (BCG) does not necessarily generate a strong enough response from lung T-cells, the researchers say. They hypothesized that administering BCG by IV or aerosol might be more effective.

They gave a group of rhesus macaques the BGC vaccine by intradermal, aerosol, or IV routes, then assessed immune responses in blood and fluid drawn from the lungs over a 24-week follow-up. Six months after vaccination, the researchers injected the vaccinated animals with a virulent strain of Mycobacterium tuberculosis (M tuberculosis) and tracked infection and disease development over 3 months.

The IV vaccination resulted in the highest durable levels of T-cells in blood and lungs. Nine of 10 animals vaccinated via IV were highly protected; 6 showed no detectable infection in any tissue tested and 3 had only very low counts of M tuberculosis in lung tissue. All unvaccinated animals and those immunized via intradermal or aerosol routes showed signs of significantly greater infection.

Upping the dose did not improve protection. The IV BCG group showed 90% protection at a threshold as low as 50 colony-forming units (the standard human ID dose is 5 x 10⁵ CFUs).

The researchers say several unique quantitative and qualitative differences in the immune responses may underlie protection. Perhaps most noteworthy, they say, was the large population of T- cells in the tissue across all lung parenchyma lobes.

The study provides a “paradigm shift,” the researchers conclude, adding that the IV route may also improve the protective capacity of other vaccines.

The standard intradermal route of delivery for Bacille Calmette–Guérin (BCG) does not necessarily generate a strong enough response from lung T-cells, the researchers say. They hypothesized that administering BCG by IV or aerosol might be more effective.

They gave a group of rhesus macaques the BGC vaccine by intradermal, aerosol, or IV routes, then assessed immune responses in blood and fluid drawn from the lungs over a 24-week follow-up. Six months after vaccination, the researchers injected the vaccinated animals with a virulent strain of Mycobacterium tuberculosis (M tuberculosis) and tracked infection and disease development over 3 months.

The IV vaccination resulted in the highest durable levels of T-cells in blood and lungs. Nine of 10 animals vaccinated via IV were highly protected; 6 showed no detectable infection in any tissue tested and 3 had only very low counts of M tuberculosis in lung tissue. All unvaccinated animals and those immunized via intradermal or aerosol routes showed signs of significantly greater infection.

Upping the dose did not improve protection. The IV BCG group showed 90% protection at a threshold as low as 50 colony-forming units (the standard human ID dose is 5 x 10⁵ CFUs).

The researchers say several unique quantitative and qualitative differences in the immune responses may underlie protection. Perhaps most noteworthy, they say, was the large population of T- cells in the tissue across all lung parenchyma lobes.

The study provides a “paradigm shift,” the researchers conclude, adding that the IV route may also improve the protective capacity of other vaccines.

The Centers for Disease Control and Prevention announced two new patients now have the 2019 Novel Coronavirus (2019-nCoV), bringing the case total in the United States to 15.

The 14th case was discovered in California among a group of people under federal quarantine after returning from the Hubei Province in China. That patient was on a U.S. State Department–chartered flight that arrived in the United States on Feb. 7.

The 15th case was discovered in Texas among a group of people who also are under federal quarantine. That patient arrived on a State Department–chartered flight that arrived on Feb. 7. It is the first person in Texas that has tested positive for 2019-nCoV.

CDC said in a statement announcing the Texas case that there “will likely be additional cases in the coming days and weeks, including among other people recently returned from Wuhan.” Officials noted that more than 600 people who have returned as part of State Department–chartered flights are currently under that 14-day quarantine.

The agency is preparing for more widespread cases of 2019-nCoV.

Nancy Messonnier, MD, director of the CDC National Center for Immunization and Respiratory Diseases, said that containment has been the early focus for the agency.

“The goal of the measures we have taken to date are to slow the introduction and impact of this disease in the United States, but at some point, we are likely to see community spread in the U.S.,” Dr. Messonnier said during a Feb. 12 teleconference with reporters. She added that the federal response will change over time as the virus spreads.

Dr. Messonnier noted that public health officials are planning for the increased demands that a wider outbreak of 2019-nCov would place on the health care delivery system, including ensuring an adequate supply of medical equipment.

gtwachtman@mdedge.com

The Centers for Disease Control and Prevention announced two new patients now have the 2019 Novel Coronavirus (2019-nCoV), bringing the case total in the United States to 15.

The 14th case was discovered in California among a group of people under federal quarantine after returning from the Hubei Province in China. That patient was on a U.S. State Department–chartered flight that arrived in the United States on Feb. 7.

The 15th case was discovered in Texas among a group of people who also are under federal quarantine. That patient arrived on a State Department–chartered flight that arrived on Feb. 7. It is the first person in Texas that has tested positive for 2019-nCoV.

CDC said in a statement announcing the Texas case that there “will likely be additional cases in the coming days and weeks, including among other people recently returned from Wuhan.” Officials noted that more than 600 people who have returned as part of State Department–chartered flights are currently under that 14-day quarantine.

The agency is preparing for more widespread cases of 2019-nCoV.

Nancy Messonnier, MD, director of the CDC National Center for Immunization and Respiratory Diseases, said that containment has been the early focus for the agency.

“The goal of the measures we have taken to date are to slow the introduction and impact of this disease in the United States, but at some point, we are likely to see community spread in the U.S.,” Dr. Messonnier said during a Feb. 12 teleconference with reporters. She added that the federal response will change over time as the virus spreads.

Dr. Messonnier noted that public health officials are planning for the increased demands that a wider outbreak of 2019-nCov would place on the health care delivery system, including ensuring an adequate supply of medical equipment.

gtwachtman@mdedge.com

The Centers for Disease Control and Prevention announced two new patients now have the 2019 Novel Coronavirus (2019-nCoV), bringing the case total in the United States to 15.

The 14th case was discovered in California among a group of people under federal quarantine after returning from the Hubei Province in China. That patient was on a U.S. State Department–chartered flight that arrived in the United States on Feb. 7.

The 15th case was discovered in Texas among a group of people who also are under federal quarantine. That patient arrived on a State Department–chartered flight that arrived on Feb. 7. It is the first person in Texas that has tested positive for 2019-nCoV.

CDC said in a statement announcing the Texas case that there “will likely be additional cases in the coming days and weeks, including among other people recently returned from Wuhan.” Officials noted that more than 600 people who have returned as part of State Department–chartered flights are currently under that 14-day quarantine.

The agency is preparing for more widespread cases of 2019-nCoV.

Nancy Messonnier, MD, director of the CDC National Center for Immunization and Respiratory Diseases, said that containment has been the early focus for the agency.

“The goal of the measures we have taken to date are to slow the introduction and impact of this disease in the United States, but at some point, we are likely to see community spread in the U.S.,” Dr. Messonnier said during a Feb. 12 teleconference with reporters. She added that the federal response will change over time as the virus spreads.

Dr. Messonnier noted that public health officials are planning for the increased demands that a wider outbreak of 2019-nCov would place on the health care delivery system, including ensuring an adequate supply of medical equipment.

gtwachtman@mdedge.com

Candida auris (C. auris) infection was first detected in New York, in July 2016. As of June 2019, 801 patients have been identified in New York as having C auris—and of those, 3 had pan-resistant infection.

CDC researchers say C auris is “a globally emerging yeast.” Cases with resistance to all 3 classes of commonly prescribed antifungal drugs have been reported in multiple countries.

In New York, of the first 277 available clinical isolates, 276 were resistant to fluconazole and 170 were resistant to amphotericin B. None were resistant to echinocandins. Subsequent testing found 99.7% of 331 isolates from infected patients with susceptibilities were resistant to fluconazole, 63% were resistant to amphotericin B, and 4% were resistant to echinocandins. Three of the subsequent isolates were pan-resistant.

The first 2 of those 3 patients were > 50 years old and residents of long-term care facilities. Each had multiple medical conditions, including ventilator dependence and colonization with multidrug-resistant bacteria. Neither patient was known to have received antifungal medications before the diagnosis of C. auris infection, but both were treated with prolonged courses of echinocandins after the diagnosis. Cultures taken after echinocandin therapy showed resistance to fluconazole, amphotericin B, and echinocandins. Both patients died, but the role of C. auris in their deaths is unclear.

The researchers found no epidemiologic links between the 2 patients. They were residents at different health care facilities, neither had any known domestic or foreign travel. No pan-resistant isolates were identified among contacts or on environmental surfaces from their rooms or common equipment at the 3 facilities where they had been patients. Although C. auris was isolated from other patients, none was pan-resistant.

A retrospective review of all New York C. auris isolates turned up a third pan-resistant patient. The patient also was aged > 50 years old , had multiple comorbidities, and a prolonged hospital and long-term care stay. However, the patient received care at a third unique facility. This third patient, who died from underlying medical conditions, was also not known to have traveled recently, and had no known contact with the other 2 patients.

Isolates from all 3 patients were initially sensitive to echinocandins. Resistance was detected after treatment, indicating it emerged during treatment with the drugs. The researchers found no evidence of transmission.

Approximately 3 years after the beginning of the New York outbreak, the pan-resistant isolates still appear to be rare, the researchers say, but “their emergence is concerning.” They urge close monitoring for patients on antifungal treatment for C. auris, along with follow-up cultures and repeat susceptibility testing, especially in patients previously treated with echinocandins.

Candida auris (C. auris) infection was first detected in New York, in July 2016. As of June 2019, 801 patients have been identified in New York as having C auris—and of those, 3 had pan-resistant infection.

CDC researchers say C auris is “a globally emerging yeast.” Cases with resistance to all 3 classes of commonly prescribed antifungal drugs have been reported in multiple countries.

In New York, of the first 277 available clinical isolates, 276 were resistant to fluconazole and 170 were resistant to amphotericin B. None were resistant to echinocandins. Subsequent testing found 99.7% of 331 isolates from infected patients with susceptibilities were resistant to fluconazole, 63% were resistant to amphotericin B, and 4% were resistant to echinocandins. Three of the subsequent isolates were pan-resistant.

The first 2 of those 3 patients were > 50 years old and residents of long-term care facilities. Each had multiple medical conditions, including ventilator dependence and colonization with multidrug-resistant bacteria. Neither patient was known to have received antifungal medications before the diagnosis of C. auris infection, but both were treated with prolonged courses of echinocandins after the diagnosis. Cultures taken after echinocandin therapy showed resistance to fluconazole, amphotericin B, and echinocandins. Both patients died, but the role of C. auris in their deaths is unclear.

The researchers found no epidemiologic links between the 2 patients. They were residents at different health care facilities, neither had any known domestic or foreign travel. No pan-resistant isolates were identified among contacts or on environmental surfaces from their rooms or common equipment at the 3 facilities where they had been patients. Although C. auris was isolated from other patients, none was pan-resistant.

A retrospective review of all New York C. auris isolates turned up a third pan-resistant patient. The patient also was aged > 50 years old , had multiple comorbidities, and a prolonged hospital and long-term care stay. However, the patient received care at a third unique facility. This third patient, who died from underlying medical conditions, was also not known to have traveled recently, and had no known contact with the other 2 patients.

Isolates from all 3 patients were initially sensitive to echinocandins. Resistance was detected after treatment, indicating it emerged during treatment with the drugs. The researchers found no evidence of transmission.

Approximately 3 years after the beginning of the New York outbreak, the pan-resistant isolates still appear to be rare, the researchers say, but “their emergence is concerning.” They urge close monitoring for patients on antifungal treatment for C. auris, along with follow-up cultures and repeat susceptibility testing, especially in patients previously treated with echinocandins.

Candida auris (C. auris) infection was first detected in New York, in July 2016. As of June 2019, 801 patients have been identified in New York as having C auris—and of those, 3 had pan-resistant infection.

CDC researchers say C auris is “a globally emerging yeast.” Cases with resistance to all 3 classes of commonly prescribed antifungal drugs have been reported in multiple countries.

In New York, of the first 277 available clinical isolates, 276 were resistant to fluconazole and 170 were resistant to amphotericin B. None were resistant to echinocandins. Subsequent testing found 99.7% of 331 isolates from infected patients with susceptibilities were resistant to fluconazole, 63% were resistant to amphotericin B, and 4% were resistant to echinocandins. Three of the subsequent isolates were pan-resistant.

The first 2 of those 3 patients were > 50 years old and residents of long-term care facilities. Each had multiple medical conditions, including ventilator dependence and colonization with multidrug-resistant bacteria. Neither patient was known to have received antifungal medications before the diagnosis of C. auris infection, but both were treated with prolonged courses of echinocandins after the diagnosis. Cultures taken after echinocandin therapy showed resistance to fluconazole, amphotericin B, and echinocandins. Both patients died, but the role of C. auris in their deaths is unclear.

The researchers found no epidemiologic links between the 2 patients. They were residents at different health care facilities, neither had any known domestic or foreign travel. No pan-resistant isolates were identified among contacts or on environmental surfaces from their rooms or common equipment at the 3 facilities where they had been patients. Although C. auris was isolated from other patients, none was pan-resistant.

A retrospective review of all New York C. auris isolates turned up a third pan-resistant patient. The patient also was aged > 50 years old , had multiple comorbidities, and a prolonged hospital and long-term care stay. However, the patient received care at a third unique facility. This third patient, who died from underlying medical conditions, was also not known to have traveled recently, and had no known contact with the other 2 patients.

Isolates from all 3 patients were initially sensitive to echinocandins. Resistance was detected after treatment, indicating it emerged during treatment with the drugs. The researchers found no evidence of transmission.

Approximately 3 years after the beginning of the New York outbreak, the pan-resistant isolates still appear to be rare, the researchers say, but “their emergence is concerning.” They urge close monitoring for patients on antifungal treatment for C. auris, along with follow-up cultures and repeat susceptibility testing, especially in patients previously treated with echinocandins.

Carbon monoxide (CO)—colorless, odorless, tasteless and highly toxic—is one of the most common causes of unintentional poisoning deaths in the US. Researchers who described their analysis of CO-related incidents in the military for the Medical Surveillance Monthly Report say military activities, materials, and settings pose “unique and potentially lethal sources of significant CO exposure.”

They reported on episodes of CO poisoning among members of the US Armed Forces between 2009 and 2019 and expanded on reports that dated back to 2001. Their analysis included reserve members and nonservice member beneficiaries.

Over the 10 years, there were 1,288 confirmed/probable cases of CO poisoning among active component service members, 366 among reserve component service members, and 4,754 among nonservice member beneficiaries. The highest number of active-duty members with CO confirmed/probable poisoning were reported at Fort Carson, Colorado (60) and NMC San Diego, California (52).

Of the confirmed/probable cases among active-duty members, 613 were classified as having unintentional intent, 538 undetermined intent, and 136 self-harm intent. One was due to assault. Most of the cases were related to work in repair/engineering occupations. Although the majority of sources were “other or unspecified,” motor vehicle exhaust accounted for 17% of the confirmed cases and all of the probable cases. Similarly, in the reserve component and among nonservice member beneficiaries, vehicle exhaust was the second-most common source.

The researchers found that CO poisoning-related injuries/diagnoses in the military often involved a single exposure that affected multiple personnel. For example, 21 soldiers showed symptoms during a multi-day exercise at the Yukon Training Center.

Excessive CO exposure is “entirely preventable,” the researchers say. Primary medical care providers—including unit medics and emergency medical technicians—should be knowledgeable about and sensitive to the “diverse and nonspecific” early clinical manifestations of CO intoxication, such as dizziness, headache, malaise, fatigue, disorientation, nausea, and vomiting. High CO exposure can cause more pronounced and severe symptoms, including syncope, seizures, acute stroke-like syndromes, and coma.

 It’s important to remember, the researchers add, that increased oxygen demand from muscular activity exacerbates the symptoms of CO exposure, but individuals at rest may experience no other symptoms before losing consciousness.

An editorial comment notes that the full impact of morbidity and mortality from CO poisoning is difficult to estimate. For one thing, because the symptoms can be so nonspecific, clinicians may not consider CO poisoning when patients present for care.

This study differs from previous ones in that it uses code data from both the Ninth and Tenth Revisions of the International Classification of Diseases. Such data, the editorial comment says, can be used at national and Military Health System–wide levels with relatively few resources, providing useful information on trends and risk factors that can be used in designing interventions

Carbon monoxide (CO)—colorless, odorless, tasteless and highly toxic—is one of the most common causes of unintentional poisoning deaths in the US. Researchers who described their analysis of CO-related incidents in the military for the Medical Surveillance Monthly Report say military activities, materials, and settings pose “unique and potentially lethal sources of significant CO exposure.”

They reported on episodes of CO poisoning among members of the US Armed Forces between 2009 and 2019 and expanded on reports that dated back to 2001. Their analysis included reserve members and nonservice member beneficiaries.

Over the 10 years, there were 1,288 confirmed/probable cases of CO poisoning among active component service members, 366 among reserve component service members, and 4,754 among nonservice member beneficiaries. The highest number of active-duty members with CO confirmed/probable poisoning were reported at Fort Carson, Colorado (60) and NMC San Diego, California (52).

Of the confirmed/probable cases among active-duty members, 613 were classified as having unintentional intent, 538 undetermined intent, and 136 self-harm intent. One was due to assault. Most of the cases were related to work in repair/engineering occupations. Although the majority of sources were “other or unspecified,” motor vehicle exhaust accounted for 17% of the confirmed cases and all of the probable cases. Similarly, in the reserve component and among nonservice member beneficiaries, vehicle exhaust was the second-most common source.

The researchers found that CO poisoning-related injuries/diagnoses in the military often involved a single exposure that affected multiple personnel. For example, 21 soldiers showed symptoms during a multi-day exercise at the Yukon Training Center.

Excessive CO exposure is “entirely preventable,” the researchers say. Primary medical care providers—including unit medics and emergency medical technicians—should be knowledgeable about and sensitive to the “diverse and nonspecific” early clinical manifestations of CO intoxication, such as dizziness, headache, malaise, fatigue, disorientation, nausea, and vomiting. High CO exposure can cause more pronounced and severe symptoms, including syncope, seizures, acute stroke-like syndromes, and coma.

 It’s important to remember, the researchers add, that increased oxygen demand from muscular activity exacerbates the symptoms of CO exposure, but individuals at rest may experience no other symptoms before losing consciousness.

An editorial comment notes that the full impact of morbidity and mortality from CO poisoning is difficult to estimate. For one thing, because the symptoms can be so nonspecific, clinicians may not consider CO poisoning when patients present for care.

This study differs from previous ones in that it uses code data from both the Ninth and Tenth Revisions of the International Classification of Diseases. Such data, the editorial comment says, can be used at national and Military Health System–wide levels with relatively few resources, providing useful information on trends and risk factors that can be used in designing interventions

Carbon monoxide (CO)—colorless, odorless, tasteless and highly toxic—is one of the most common causes of unintentional poisoning deaths in the US. Researchers who described their analysis of CO-related incidents in the military for the Medical Surveillance Monthly Report say military activities, materials, and settings pose “unique and potentially lethal sources of significant CO exposure.”

They reported on episodes of CO poisoning among members of the US Armed Forces between 2009 and 2019 and expanded on reports that dated back to 2001. Their analysis included reserve members and nonservice member beneficiaries.

Over the 10 years, there were 1,288 confirmed/probable cases of CO poisoning among active component service members, 366 among reserve component service members, and 4,754 among nonservice member beneficiaries. The highest number of active-duty members with CO confirmed/probable poisoning were reported at Fort Carson, Colorado (60) and NMC San Diego, California (52).

Of the confirmed/probable cases among active-duty members, 613 were classified as having unintentional intent, 538 undetermined intent, and 136 self-harm intent. One was due to assault. Most of the cases were related to work in repair/engineering occupations. Although the majority of sources were “other or unspecified,” motor vehicle exhaust accounted for 17% of the confirmed cases and all of the probable cases. Similarly, in the reserve component and among nonservice member beneficiaries, vehicle exhaust was the second-most common source.

The researchers found that CO poisoning-related injuries/diagnoses in the military often involved a single exposure that affected multiple personnel. For example, 21 soldiers showed symptoms during a multi-day exercise at the Yukon Training Center.

Excessive CO exposure is “entirely preventable,” the researchers say. Primary medical care providers—including unit medics and emergency medical technicians—should be knowledgeable about and sensitive to the “diverse and nonspecific” early clinical manifestations of CO intoxication, such as dizziness, headache, malaise, fatigue, disorientation, nausea, and vomiting. High CO exposure can cause more pronounced and severe symptoms, including syncope, seizures, acute stroke-like syndromes, and coma.

 It’s important to remember, the researchers add, that increased oxygen demand from muscular activity exacerbates the symptoms of CO exposure, but individuals at rest may experience no other symptoms before losing consciousness.

An editorial comment notes that the full impact of morbidity and mortality from CO poisoning is difficult to estimate. For one thing, because the symptoms can be so nonspecific, clinicians may not consider CO poisoning when patients present for care.

This study differs from previous ones in that it uses code data from both the Ninth and Tenth Revisions of the International Classification of Diseases. Such data, the editorial comment says, can be used at national and Military Health System–wide levels with relatively few resources, providing useful information on trends and risk factors that can be used in designing interventions

The Centers for Disease Control and Prevention announced the number of confirmed cases of the 2019 Novel Coronavirus (2019-nCoV) in the United States has reached 13.

Gregory Twachtman/MDedge News

The latest case, announced Feb. 11, 2020, by the CDC, was in a person in California who was previously under federal quarantine because the patient had traveled to Wuhan, China.

The CDC is currently looking into who the patient may have come in contact with to understand the potential for further spread of the coronavirus.

“The contact investigation is ongoing,” CDC principal deputy director Anne Schuchat, MD, said during a Feb. 11 press conference to provide an update on coronavirus containment activities being taken by the CDC.

Dr. Schuchat also addressed issues related to the laboratory test, as the patient in California was initially thought to be negative for the coronavirus.

“With other cases around the country that we are evaluating, we have been doing serial tests to understand whether they are still infectious” and to gather other information about how results change over time, Dr. Schuchat said.

She noted that the CDC does not “have as much information as we would like on the severity of the virus,” noting that there are many cases in China with severe reactions, while the 13 cases in the United States represent a much more mild reaction to the virus so far.

With the latest case in California, she noted that there was “probably a mix-up and the original test wasn’t negative,” although she did not elaborate on what the nature of the mix-up was, stating that was all the information that she had.

In general, Dr. Schuchat touted the actions taken by the CDC and the federal government focused primarily on containing the spread of the virus in the United States, including the implementation of travel advisories, quarantining passengers returning from China, as well as the new test kits that are being distributed by the agency across the nation and around the world. She also mentioned CDC staff are being deployed around the world to monitor the spreading of the disease and highlighted the outreach efforts to keep the public informed.

Dr. Schuchat highlighted the fact that, of the 13 cases in the United States, 11 were with patients that were in Wuhan, and only 2 were because of close contact with a patient, something that she attributed to the actions being taken.

She also noted that cases in the United States have not been as severe as they have been in China, where deaths have been attributed to the coronavirus outbreak. She added that there have been only two deaths outside of mainland China attributed to the coronavirus.

“Some of the steps the CDC has taken have really put us in better shape should widespread transmission occur in the United States,” she said.

Dr. Schuchat also highlighted that the first charter flight of people quarantined after returning from Wuhan have reached the 14-day milestone and should be on their way home beginning today.

gtwachtman@mdedge.com

The Centers for Disease Control and Prevention announced the number of confirmed cases of the 2019 Novel Coronavirus (2019-nCoV) in the United States has reached 13.

Gregory Twachtman/MDedge News

The latest case, announced Feb. 11, 2020, by the CDC, was in a person in California who was previously under federal quarantine because the patient had traveled to Wuhan, China.

The CDC is currently looking into who the patient may have come in contact with to understand the potential for further spread of the coronavirus.

“The contact investigation is ongoing,” CDC principal deputy director Anne Schuchat, MD, said during a Feb. 11 press conference to provide an update on coronavirus containment activities being taken by the CDC.

Dr. Schuchat also addressed issues related to the laboratory test, as the patient in California was initially thought to be negative for the coronavirus.

“With other cases around the country that we are evaluating, we have been doing serial tests to understand whether they are still infectious” and to gather other information about how results change over time, Dr. Schuchat said.

She noted that the CDC does not “have as much information as we would like on the severity of the virus,” noting that there are many cases in China with severe reactions, while the 13 cases in the United States represent a much more mild reaction to the virus so far.

With the latest case in California, she noted that there was “probably a mix-up and the original test wasn’t negative,” although she did not elaborate on what the nature of the mix-up was, stating that was all the information that she had.

In general, Dr. Schuchat touted the actions taken by the CDC and the federal government focused primarily on containing the spread of the virus in the United States, including the implementation of travel advisories, quarantining passengers returning from China, as well as the new test kits that are being distributed by the agency across the nation and around the world. She also mentioned CDC staff are being deployed around the world to monitor the spreading of the disease and highlighted the outreach efforts to keep the public informed.

Dr. Schuchat highlighted the fact that, of the 13 cases in the United States, 11 were with patients that were in Wuhan, and only 2 were because of close contact with a patient, something that she attributed to the actions being taken.

She also noted that cases in the United States have not been as severe as they have been in China, where deaths have been attributed to the coronavirus outbreak. She added that there have been only two deaths outside of mainland China attributed to the coronavirus.

“Some of the steps the CDC has taken have really put us in better shape should widespread transmission occur in the United States,” she said.

Dr. Schuchat also highlighted that the first charter flight of people quarantined after returning from Wuhan have reached the 14-day milestone and should be on their way home beginning today.

gtwachtman@mdedge.com

The Centers for Disease Control and Prevention announced the number of confirmed cases of the 2019 Novel Coronavirus (2019-nCoV) in the United States has reached 13.

Gregory Twachtman/MDedge News

The latest case, announced Feb. 11, 2020, by the CDC, was in a person in California who was previously under federal quarantine because the patient had traveled to Wuhan, China.

The CDC is currently looking into who the patient may have come in contact with to understand the potential for further spread of the coronavirus.

“The contact investigation is ongoing,” CDC principal deputy director Anne Schuchat, MD, said during a Feb. 11 press conference to provide an update on coronavirus containment activities being taken by the CDC.

Dr. Schuchat also addressed issues related to the laboratory test, as the patient in California was initially thought to be negative for the coronavirus.

“With other cases around the country that we are evaluating, we have been doing serial tests to understand whether they are still infectious” and to gather other information about how results change over time, Dr. Schuchat said.

She noted that the CDC does not “have as much information as we would like on the severity of the virus,” noting that there are many cases in China with severe reactions, while the 13 cases in the United States represent a much more mild reaction to the virus so far.

With the latest case in California, she noted that there was “probably a mix-up and the original test wasn’t negative,” although she did not elaborate on what the nature of the mix-up was, stating that was all the information that she had.

In general, Dr. Schuchat touted the actions taken by the CDC and the federal government focused primarily on containing the spread of the virus in the United States, including the implementation of travel advisories, quarantining passengers returning from China, as well as the new test kits that are being distributed by the agency across the nation and around the world. She also mentioned CDC staff are being deployed around the world to monitor the spreading of the disease and highlighted the outreach efforts to keep the public informed.

Dr. Schuchat highlighted the fact that, of the 13 cases in the United States, 11 were with patients that were in Wuhan, and only 2 were because of close contact with a patient, something that she attributed to the actions being taken.

She also noted that cases in the United States have not been as severe as they have been in China, where deaths have been attributed to the coronavirus outbreak. She added that there have been only two deaths outside of mainland China attributed to the coronavirus.

“Some of the steps the CDC has taken have really put us in better shape should widespread transmission occur in the United States,” she said.

Dr. Schuchat also highlighted that the first charter flight of people quarantined after returning from Wuhan have reached the 14-day milestone and should be on their way home beginning today.

gtwachtman@mdedge.com

ANSWER

The correct answer is psoriasis vulgaris (choice “a”).

DISCUSSION

At least 30% of patients with psoriasis have a family history of the disease—a meaningful clue in developing a differential. Besides asking about the history, always look for corroborating signs in areas where the disease is commonly seen (eg, the fingernails). In this case, further corroboration was provided by the history of illness at the time of the rash’s onset; what was initially strep-driven guttate psoriasis morphed into full-blown psoriasis vulgaris.

The heavy scales, with their salmon-pink base, tipped the scales in favor of psoriasis as the diagnosis. The pinpoint bleeding (known as the Auspitz sign), although not pathognomic for psoriasis, is certainly suggestive of it.

In adults, these findings would probably have been sufficient to settle on psoriasis. But before labeling a young child with a serious, lifelong diagnosis, it was necessary to be sure. For one thing, advanced psoriasis is very unusual in children as young as this patient, and for another, treatment would likely be problematic. Fortunately for clarity’s sake, the biopsy was consistent with psoriasis and inconsistent with the other items in the differential.

TREATMENT

The patient was prescribed a topical steroid cream to apply every other day, alternating with vitamin D–derived ointment. In addition, he was advised to increase his exposure to natural sunlight. Phototherapy with narrow-band ultraviolet light B would be a superior option, but his family lives too far from the clinic to make 3 roundtrips per week for such treatment.

If these measures fail, a biologic agent may be appropriate. Unfortunately, the patient’s insurance carrier requires the failure of several other modalities before it will approve use of such therapy.

ANSWER

The correct answer is psoriasis vulgaris (choice “a”).

DISCUSSION

At least 30% of patients with psoriasis have a family history of the disease—a meaningful clue in developing a differential. Besides asking about the history, always look for corroborating signs in areas where the disease is commonly seen (eg, the fingernails). In this case, further corroboration was provided by the history of illness at the time of the rash’s onset; what was initially strep-driven guttate psoriasis morphed into full-blown psoriasis vulgaris.

The heavy scales, with their salmon-pink base, tipped the scales in favor of psoriasis as the diagnosis. The pinpoint bleeding (known as the Auspitz sign), although not pathognomic for psoriasis, is certainly suggestive of it.

In adults, these findings would probably have been sufficient to settle on psoriasis. But before labeling a young child with a serious, lifelong diagnosis, it was necessary to be sure. For one thing, advanced psoriasis is very unusual in children as young as this patient, and for another, treatment would likely be problematic. Fortunately for clarity’s sake, the biopsy was consistent with psoriasis and inconsistent with the other items in the differential.

TREATMENT

The patient was prescribed a topical steroid cream to apply every other day, alternating with vitamin D–derived ointment. In addition, he was advised to increase his exposure to natural sunlight. Phototherapy with narrow-band ultraviolet light B would be a superior option, but his family lives too far from the clinic to make 3 roundtrips per week for such treatment.

If these measures fail, a biologic agent may be appropriate. Unfortunately, the patient’s insurance carrier requires the failure of several other modalities before it will approve use of such therapy.

ANSWER

The correct answer is psoriasis vulgaris (choice “a”).

DISCUSSION

At least 30% of patients with psoriasis have a family history of the disease—a meaningful clue in developing a differential. Besides asking about the history, always look for corroborating signs in areas where the disease is commonly seen (eg, the fingernails). In this case, further corroboration was provided by the history of illness at the time of the rash’s onset; what was initially strep-driven guttate psoriasis morphed into full-blown psoriasis vulgaris.

The heavy scales, with their salmon-pink base, tipped the scales in favor of psoriasis as the diagnosis. The pinpoint bleeding (known as the Auspitz sign), although not pathognomic for psoriasis, is certainly suggestive of it.

In adults, these findings would probably have been sufficient to settle on psoriasis. But before labeling a young child with a serious, lifelong diagnosis, it was necessary to be sure. For one thing, advanced psoriasis is very unusual in children as young as this patient, and for another, treatment would likely be problematic. Fortunately for clarity’s sake, the biopsy was consistent with psoriasis and inconsistent with the other items in the differential.

TREATMENT

The patient was prescribed a topical steroid cream to apply every other day, alternating with vitamin D–derived ointment. In addition, he was advised to increase his exposure to natural sunlight. Phototherapy with narrow-band ultraviolet light B would be a superior option, but his family lives too far from the clinic to make 3 roundtrips per week for such treatment.

If these measures fail, a biologic agent may be appropriate. Unfortunately, the patient’s insurance carrier requires the failure of several other modalities before it will approve use of such therapy.

New research results reinforce the benefits of quitting smoking.
 

Not only does it stop further damage to the lungs, it appears that it also allows new, healthy cells to actively replenish the lining of the airways. This shift in the proportion of healthy cells to damaged cells could reduce the risk for lung cancer, say researchers.

The findings were published online in Nature (2020 Jan 29. doi: 10.1038/s41586-020-1961-1).

The team performed whole-genome sequencing on healthy airway cells collected (during a bronchoscopy for clinical indications) from current smokers and ex-smokers, as well as from adult never-smokers and children.

The investigators found, as expected, that the cells from current and ex-smokers had a far higher mutational burden than those of never-smokers and children, including an increased number of “driver” mutations, which increase the potential of cells to become cancerous.

However, they also found that in ex-smokers – but not in current smokers – up to 40% of the cells were near normal, with far less genetic damage and a low risk of developing cancer.

“People who have smoked heavily for 30, 40 or more years often say to me that it’s too late to stop smoking – the damage is already done,” commented senior author Peter J. Campbell, PhD, Cancer Genome Project, Wellcome Trust Sanger Institute, Hinxton, England.

“What is so exciting about our study is that it shows that it’s never too late to quit. Some of the people in our study had smoked more than 15,000 packs of cigarettes over their life, but within a few years of quitting, many of the cells lining their airways showed no evidence of damage from tobacco,” he said. The comments appear in a press release issued by Cancer Research UK, which partly funded the study.

This study has “broadened our understanding of the effects of tobacco smoke on normal epithelial cells in the human lung,” Gerd P. Pfeifer, PhD, at the Center for Epigenetics, Van Andel Institute, Grand Rapids, Michigan, writes in an accompanying comment.

“It has shed light on how the protective effect of smoking cessation plays out at the molecular level in human lung tissue and raises many interesting questions worthy of future investigation,” he added.
 

‘Important public health message’

Joint senior author Sam M. Janes, PhD, Lungs for Living Research Center, UCL Respiratory, University College London, added that the study has “an important public health message.

“Stopping smoking at any age does not just slow the accumulation of further damage but could reawaken cells unharmed by past lifestyle choices,” he said.

“Further research into this process could help to understand how these cells protect against cancer and could potentially lead to new avenues of research into anticancer therapeutics,” Dr. James added.

In an interview, Dr. Campbell said that the team would next like to try “to find where this reservoir of normal cells hides out while the patient is smoking. We have some ideas from mouse models and we think, by adapting the methods we used in this study, we will be able to test that hypothesis directly.”

He continued: “If we can find this stem cell niche, then we can study the biology of the cells living in there and what makes them expand when a patient stops smoking.

“Once we understand that biology, we can think about therapies to target that population of cells in beneficial ways.”

Dr. Campbell concluded that they are “a long way away yet, but the toolkit exists for getting there.”
 

Tobacco and mutagenesis

In their article, the team notes that the model explaining how tobacco exposure causes lung cancer centers on the notion that the 60-plus carcinogens in cigarette smoke directly cause mutagenesis, which combines with the indirect effects of inflammation, immune suppression, and infection to lead to cancer.

However, this does not explain why individuals who stop smoking in middle age or earlier “avoid most of the risk of tobacco-associated lung cancer.”

They questioned the relationship between tobacco and mutagenesis. For two people who smoke the same number of cigarettes over their lifetime, the observation that the person with longer duration of cessation has a lower risk for lung cancer is difficult to explain if carcinogenesis is induced exclusively by an increase in the mutational burden, they noted.

To investigate further, the team set out to examine the “landscape” of somatic mutations in normal bronchial epithelium. They recruited 16 individuals: three children, four never-smokers, six ex-smokers, and three current smokers.

All the participants underwent bronchoscopy for clinical indications. Samples of airway epithelium were obtained from biopsies or brushings of main or secondary bronchi.

The researchers performed whole-genome sequencing of 632 colonies derived from single bronchial epithelial cells. In addition, cells from squamous cell carcinoma or carcinoma in situ from three of the patients were sequenced.
 

Cells show different mutational burdens

The results showed there was “considerable heterogeneity” in mutational burden both between patients and in individual patients.

Moreover, single-base substitutions increased significantly with age, at an estimated rate of 22 per cell per year (P = 10^–8). In addition, previous and current smoking substantially increased the substitution burden by an estimated 2,330 per cell in ex-smokers and 5,300 per cell in current smokers.

The team was surprised to find that smoking also increased the variability of the mutational burden from cell to cell, “even within the same individual.”

They calculated that, even between cells from a small biopsy sample of normal airway, the standard deviation in mutational burden was 2,350 per cell in ex-smokers and 2,100 per cell in current smokers, but only 140 per cell in children and 290 per cell in adult never-smokers (P less than 10^–16 for within-subject heterogeneity).

Between individuals, the mean substitution burden was 1,200 per cell in ex-smokers, 1,260 per cell in current smokers, and 90 per cell for nonsmokers (P = 10^–8 for heterogeneity).

Driver mutations were also more common in individuals who had a history of smoking. In those persons, they were seen in at least 25% of cells vs. 4%-14% of cells from adult never-smokers and none of the cells from children.

It was calculated that current smokers had a 2.1-fold increase in the number of driver mutations per cell in comparison with never-smokers (P = .04).

In addition, the number of driver mutations per cell increased 1.5-fold with every decade of life (P = .004) and twofold for every 5,000 extra somatic mutations per cell (P = .0003).

However, the team also found that some patients among the ex-smokers and current smokers had cells with a near-normal mutational burden, similar to that seen for never-smokers of the equivalent age.

Although these cells were rare in current smokers, their relative frequency was, the team reports, an average fourfold higher in ex-smokers and accounted for between 20% and 40% of all cells studied.

Further analysis showed that these near-normal cells had less damage from tobacco-specific mutational processes than other cells and that they had longer telomeres.

“Two points remain unclear: how these cells have avoided the high rates of mutations that are exhibited by neighbouring cells, and why this particular population of cells expands after smoking cessation,” the team writes.

They argue that the presence of longer telomeres suggests they are “recent descendants of quiescent stem cells,” which have been found in mice but “remain elusive” in human lungs.

“The apparent expansion of the near-normal cells could represent the expected physiology of a two-compartment model in which relatively short-lived proliferative progenitors are slowly replenished from a pool of quiescent stem cells, but the progenitors are more exposed to tobacco carcinogens,” they suggest.

“Only in ex-smokers would the difference in mutagenic environment be sufficient to distinguish newly produced progenitors from long-term occupants of the bronchial epithelial surface,” they add.

However, in his commentary, Dr. Pfeifer highlights that a “potential caveat” of the study is the small number of individuals (n = 16) from whom cells were taken.

In addition, Dr. Pfeifer notes that the “lack of knowledge” about the suggested “long-lived stem cells and information about the longevity of the different cell types in the human lung make it difficult to explain what occurred in the ex-smokers’ cells with few mutations.”

The study was supported by a Cancer Research UK Grand Challenge Award and the Wellcome Trust. Dr. Campbell and Dr. Janes are Wellcome Trust senior clinical fellows. The authors have disclosed no relevant financial relationships.
 

This article first appeared on Medscape.com.

New research results reinforce the benefits of quitting smoking.
 

Not only does it stop further damage to the lungs, it appears that it also allows new, healthy cells to actively replenish the lining of the airways. This shift in the proportion of healthy cells to damaged cells could reduce the risk for lung cancer, say researchers.

The findings were published online in Nature (2020 Jan 29. doi: 10.1038/s41586-020-1961-1).

The team performed whole-genome sequencing on healthy airway cells collected (during a bronchoscopy for clinical indications) from current smokers and ex-smokers, as well as from adult never-smokers and children.

The investigators found, as expected, that the cells from current and ex-smokers had a far higher mutational burden than those of never-smokers and children, including an increased number of “driver” mutations, which increase the potential of cells to become cancerous.

However, they also found that in ex-smokers – but not in current smokers – up to 40% of the cells were near normal, with far less genetic damage and a low risk of developing cancer.

“People who have smoked heavily for 30, 40 or more years often say to me that it’s too late to stop smoking – the damage is already done,” commented senior author Peter J. Campbell, PhD, Cancer Genome Project, Wellcome Trust Sanger Institute, Hinxton, England.

“What is so exciting about our study is that it shows that it’s never too late to quit. Some of the people in our study had smoked more than 15,000 packs of cigarettes over their life, but within a few years of quitting, many of the cells lining their airways showed no evidence of damage from tobacco,” he said. The comments appear in a press release issued by Cancer Research UK, which partly funded the study.

This study has “broadened our understanding of the effects of tobacco smoke on normal epithelial cells in the human lung,” Gerd P. Pfeifer, PhD, at the Center for Epigenetics, Van Andel Institute, Grand Rapids, Michigan, writes in an accompanying comment.

“It has shed light on how the protective effect of smoking cessation plays out at the molecular level in human lung tissue and raises many interesting questions worthy of future investigation,” he added.
 

‘Important public health message’

Joint senior author Sam M. Janes, PhD, Lungs for Living Research Center, UCL Respiratory, University College London, added that the study has “an important public health message.

“Stopping smoking at any age does not just slow the accumulation of further damage but could reawaken cells unharmed by past lifestyle choices,” he said.

“Further research into this process could help to understand how these cells protect against cancer and could potentially lead to new avenues of research into anticancer therapeutics,” Dr. James added.

In an interview, Dr. Campbell said that the team would next like to try “to find where this reservoir of normal cells hides out while the patient is smoking. We have some ideas from mouse models and we think, by adapting the methods we used in this study, we will be able to test that hypothesis directly.”

He continued: “If we can find this stem cell niche, then we can study the biology of the cells living in there and what makes them expand when a patient stops smoking.

“Once we understand that biology, we can think about therapies to target that population of cells in beneficial ways.”

Dr. Campbell concluded that they are “a long way away yet, but the toolkit exists for getting there.”
 

Tobacco and mutagenesis

In their article, the team notes that the model explaining how tobacco exposure causes lung cancer centers on the notion that the 60-plus carcinogens in cigarette smoke directly cause mutagenesis, which combines with the indirect effects of inflammation, immune suppression, and infection to lead to cancer.

However, this does not explain why individuals who stop smoking in middle age or earlier “avoid most of the risk of tobacco-associated lung cancer.”

They questioned the relationship between tobacco and mutagenesis. For two people who smoke the same number of cigarettes over their lifetime, the observation that the person with longer duration of cessation has a lower risk for lung cancer is difficult to explain if carcinogenesis is induced exclusively by an increase in the mutational burden, they noted.

To investigate further, the team set out to examine the “landscape” of somatic mutations in normal bronchial epithelium. They recruited 16 individuals: three children, four never-smokers, six ex-smokers, and three current smokers.

All the participants underwent bronchoscopy for clinical indications. Samples of airway epithelium were obtained from biopsies or brushings of main or secondary bronchi.

The researchers performed whole-genome sequencing of 632 colonies derived from single bronchial epithelial cells. In addition, cells from squamous cell carcinoma or carcinoma in situ from three of the patients were sequenced.
 

Cells show different mutational burdens

The results showed there was “considerable heterogeneity” in mutational burden both between patients and in individual patients.

Moreover, single-base substitutions increased significantly with age, at an estimated rate of 22 per cell per year (P = 10^–8). In addition, previous and current smoking substantially increased the substitution burden by an estimated 2,330 per cell in ex-smokers and 5,300 per cell in current smokers.

The team was surprised to find that smoking also increased the variability of the mutational burden from cell to cell, “even within the same individual.”

They calculated that, even between cells from a small biopsy sample of normal airway, the standard deviation in mutational burden was 2,350 per cell in ex-smokers and 2,100 per cell in current smokers, but only 140 per cell in children and 290 per cell in adult never-smokers (P less than 10^–16 for within-subject heterogeneity).

Between individuals, the mean substitution burden was 1,200 per cell in ex-smokers, 1,260 per cell in current smokers, and 90 per cell for nonsmokers (P = 10^–8 for heterogeneity).

Driver mutations were also more common in individuals who had a history of smoking. In those persons, they were seen in at least 25% of cells vs. 4%-14% of cells from adult never-smokers and none of the cells from children.

It was calculated that current smokers had a 2.1-fold increase in the number of driver mutations per cell in comparison with never-smokers (P = .04).

In addition, the number of driver mutations per cell increased 1.5-fold with every decade of life (P = .004) and twofold for every 5,000 extra somatic mutations per cell (P = .0003).

However, the team also found that some patients among the ex-smokers and current smokers had cells with a near-normal mutational burden, similar to that seen for never-smokers of the equivalent age.

Although these cells were rare in current smokers, their relative frequency was, the team reports, an average fourfold higher in ex-smokers and accounted for between 20% and 40% of all cells studied.

Further analysis showed that these near-normal cells had less damage from tobacco-specific mutational processes than other cells and that they had longer telomeres.

“Two points remain unclear: how these cells have avoided the high rates of mutations that are exhibited by neighbouring cells, and why this particular population of cells expands after smoking cessation,” the team writes.

They argue that the presence of longer telomeres suggests they are “recent descendants of quiescent stem cells,” which have been found in mice but “remain elusive” in human lungs.

“The apparent expansion of the near-normal cells could represent the expected physiology of a two-compartment model in which relatively short-lived proliferative progenitors are slowly replenished from a pool of quiescent stem cells, but the progenitors are more exposed to tobacco carcinogens,” they suggest.

“Only in ex-smokers would the difference in mutagenic environment be sufficient to distinguish newly produced progenitors from long-term occupants of the bronchial epithelial surface,” they add.

However, in his commentary, Dr. Pfeifer highlights that a “potential caveat” of the study is the small number of individuals (n = 16) from whom cells were taken.

In addition, Dr. Pfeifer notes that the “lack of knowledge” about the suggested “long-lived stem cells and information about the longevity of the different cell types in the human lung make it difficult to explain what occurred in the ex-smokers’ cells with few mutations.”

The study was supported by a Cancer Research UK Grand Challenge Award and the Wellcome Trust. Dr. Campbell and Dr. Janes are Wellcome Trust senior clinical fellows. The authors have disclosed no relevant financial relationships.
 

This article first appeared on Medscape.com.

New research results reinforce the benefits of quitting smoking.
 

Not only does it stop further damage to the lungs, it appears that it also allows new, healthy cells to actively replenish the lining of the airways. This shift in the proportion of healthy cells to damaged cells could reduce the risk for lung cancer, say researchers.

The findings were published online in Nature (2020 Jan 29. doi: 10.1038/s41586-020-1961-1).

The team performed whole-genome sequencing on healthy airway cells collected (during a bronchoscopy for clinical indications) from current smokers and ex-smokers, as well as from adult never-smokers and children.

The investigators found, as expected, that the cells from current and ex-smokers had a far higher mutational burden than those of never-smokers and children, including an increased number of “driver” mutations, which increase the potential of cells to become cancerous.

However, they also found that in ex-smokers – but not in current smokers – up to 40% of the cells were near normal, with far less genetic damage and a low risk of developing cancer.

“People who have smoked heavily for 30, 40 or more years often say to me that it’s too late to stop smoking – the damage is already done,” commented senior author Peter J. Campbell, PhD, Cancer Genome Project, Wellcome Trust Sanger Institute, Hinxton, England.

“What is so exciting about our study is that it shows that it’s never too late to quit. Some of the people in our study had smoked more than 15,000 packs of cigarettes over their life, but within a few years of quitting, many of the cells lining their airways showed no evidence of damage from tobacco,” he said. The comments appear in a press release issued by Cancer Research UK, which partly funded the study.

This study has “broadened our understanding of the effects of tobacco smoke on normal epithelial cells in the human lung,” Gerd P. Pfeifer, PhD, at the Center for Epigenetics, Van Andel Institute, Grand Rapids, Michigan, writes in an accompanying comment.

“It has shed light on how the protective effect of smoking cessation plays out at the molecular level in human lung tissue and raises many interesting questions worthy of future investigation,” he added.
 

‘Important public health message’

Joint senior author Sam M. Janes, PhD, Lungs for Living Research Center, UCL Respiratory, University College London, added that the study has “an important public health message.

“Stopping smoking at any age does not just slow the accumulation of further damage but could reawaken cells unharmed by past lifestyle choices,” he said.

“Further research into this process could help to understand how these cells protect against cancer and could potentially lead to new avenues of research into anticancer therapeutics,” Dr. James added.

In an interview, Dr. Campbell said that the team would next like to try “to find where this reservoir of normal cells hides out while the patient is smoking. We have some ideas from mouse models and we think, by adapting the methods we used in this study, we will be able to test that hypothesis directly.”

He continued: “If we can find this stem cell niche, then we can study the biology of the cells living in there and what makes them expand when a patient stops smoking.

“Once we understand that biology, we can think about therapies to target that population of cells in beneficial ways.”

Dr. Campbell concluded that they are “a long way away yet, but the toolkit exists for getting there.”
 

Tobacco and mutagenesis

In their article, the team notes that the model explaining how tobacco exposure causes lung cancer centers on the notion that the 60-plus carcinogens in cigarette smoke directly cause mutagenesis, which combines with the indirect effects of inflammation, immune suppression, and infection to lead to cancer.

However, this does not explain why individuals who stop smoking in middle age or earlier “avoid most of the risk of tobacco-associated lung cancer.”

They questioned the relationship between tobacco and mutagenesis. For two people who smoke the same number of cigarettes over their lifetime, the observation that the person with longer duration of cessation has a lower risk for lung cancer is difficult to explain if carcinogenesis is induced exclusively by an increase in the mutational burden, they noted.

To investigate further, the team set out to examine the “landscape” of somatic mutations in normal bronchial epithelium. They recruited 16 individuals: three children, four never-smokers, six ex-smokers, and three current smokers.

All the participants underwent bronchoscopy for clinical indications. Samples of airway epithelium were obtained from biopsies or brushings of main or secondary bronchi.

The researchers performed whole-genome sequencing of 632 colonies derived from single bronchial epithelial cells. In addition, cells from squamous cell carcinoma or carcinoma in situ from three of the patients were sequenced.
 

Cells show different mutational burdens

The results showed there was “considerable heterogeneity” in mutational burden both between patients and in individual patients.

Moreover, single-base substitutions increased significantly with age, at an estimated rate of 22 per cell per year (P = 10^–8). In addition, previous and current smoking substantially increased the substitution burden by an estimated 2,330 per cell in ex-smokers and 5,300 per cell in current smokers.

The team was surprised to find that smoking also increased the variability of the mutational burden from cell to cell, “even within the same individual.”

They calculated that, even between cells from a small biopsy sample of normal airway, the standard deviation in mutational burden was 2,350 per cell in ex-smokers and 2,100 per cell in current smokers, but only 140 per cell in children and 290 per cell in adult never-smokers (P less than 10^–16 for within-subject heterogeneity).

Between individuals, the mean substitution burden was 1,200 per cell in ex-smokers, 1,260 per cell in current smokers, and 90 per cell for nonsmokers (P = 10^–8 for heterogeneity).

Driver mutations were also more common in individuals who had a history of smoking. In those persons, they were seen in at least 25% of cells vs. 4%-14% of cells from adult never-smokers and none of the cells from children.

It was calculated that current smokers had a 2.1-fold increase in the number of driver mutations per cell in comparison with never-smokers (P = .04).

In addition, the number of driver mutations per cell increased 1.5-fold with every decade of life (P = .004) and twofold for every 5,000 extra somatic mutations per cell (P = .0003).

However, the team also found that some patients among the ex-smokers and current smokers had cells with a near-normal mutational burden, similar to that seen for never-smokers of the equivalent age.

Although these cells were rare in current smokers, their relative frequency was, the team reports, an average fourfold higher in ex-smokers and accounted for between 20% and 40% of all cells studied.

Further analysis showed that these near-normal cells had less damage from tobacco-specific mutational processes than other cells and that they had longer telomeres.

“Two points remain unclear: how these cells have avoided the high rates of mutations that are exhibited by neighbouring cells, and why this particular population of cells expands after smoking cessation,” the team writes.

They argue that the presence of longer telomeres suggests they are “recent descendants of quiescent stem cells,” which have been found in mice but “remain elusive” in human lungs.

“The apparent expansion of the near-normal cells could represent the expected physiology of a two-compartment model in which relatively short-lived proliferative progenitors are slowly replenished from a pool of quiescent stem cells, but the progenitors are more exposed to tobacco carcinogens,” they suggest.

“Only in ex-smokers would the difference in mutagenic environment be sufficient to distinguish newly produced progenitors from long-term occupants of the bronchial epithelial surface,” they add.

However, in his commentary, Dr. Pfeifer highlights that a “potential caveat” of the study is the small number of individuals (n = 16) from whom cells were taken.

In addition, Dr. Pfeifer notes that the “lack of knowledge” about the suggested “long-lived stem cells and information about the longevity of the different cell types in the human lung make it difficult to explain what occurred in the ex-smokers’ cells with few mutations.”

The study was supported by a Cancer Research UK Grand Challenge Award and the Wellcome Trust. Dr. Campbell and Dr. Janes are Wellcome Trust senior clinical fellows. The authors have disclosed no relevant financial relationships.
 

This article first appeared on Medscape.com.

For the second time during the 2019-2020 flu season, activity measures have climbed into noteworthy territory.

The proportion of outpatient visits for influenza-like illness (ILI) reached its highest December level, 7.1%, since 2003 and then dropped for 2 weeks. Three weeks of increases since then, however, have the outpatient-visit rate at 6.7% for the week ending Feb. 1, 2020, the Centers for Disease Control and Prevention reported. The baseline rate for the United States is 2.4%.

That rate of 6.7% is already above the highest rates recorded in eight of the last nine flu seasons, and another increase could mean a second, separate trip above 7.0% in the 2019-2020 season – something that has not occurred since national tracking began in 1997, CDC data show.

Those same data also show that, from 1997-1998 to 2018-2019, the United States has spent a total of 11 weeks above the 7.0% mark for ILI-related visits.

Another important measure on the rise, the proportion of respiratory specimens testing positive for influenza, reached a new high for the season, 29.8%, during the week of Feb. 1, the CDC’s influenza division said.

Tests at clinical laboratories also show that predominance is continuing to switch from type B (45.6%) to type A (54.4%), the influenza division noted. Overall predominance for the season, however, continues to favor type B, 59.3% to 40.7%.

The percentage of deaths caused by pneumonia and influenza, which passed the threshold for epidemic of 7.2% back in early January, has been trending downward for the last 3 weeks and was 7.1% as of Feb. 1, according to the influenza division.

ILI-related deaths among children continue to remain high, with a total count of 78 for the season after another 10 deaths were reported during the week ending Feb. 1, the CDC reported. Comparable numbers for the last three seasons are 44 (2018-2019), 97 (2017-2018), and 35 (2016-2017).

The CDC estimates put the total number of ILIs at around 22 million for the season so far, leading to 210,000 hospitalizations. The agency said that it expects to release estimates of vaccine effectiveness later this month.

rfranki@mdedge.com

For the second time during the 2019-2020 flu season, activity measures have climbed into noteworthy territory.

The proportion of outpatient visits for influenza-like illness (ILI) reached its highest December level, 7.1%, since 2003 and then dropped for 2 weeks. Three weeks of increases since then, however, have the outpatient-visit rate at 6.7% for the week ending Feb. 1, 2020, the Centers for Disease Control and Prevention reported. The baseline rate for the United States is 2.4%.

That rate of 6.7% is already above the highest rates recorded in eight of the last nine flu seasons, and another increase could mean a second, separate trip above 7.0% in the 2019-2020 season – something that has not occurred since national tracking began in 1997, CDC data show.

Those same data also show that, from 1997-1998 to 2018-2019, the United States has spent a total of 11 weeks above the 7.0% mark for ILI-related visits.

Another important measure on the rise, the proportion of respiratory specimens testing positive for influenza, reached a new high for the season, 29.8%, during the week of Feb. 1, the CDC’s influenza division said.

Tests at clinical laboratories also show that predominance is continuing to switch from type B (45.6%) to type A (54.4%), the influenza division noted. Overall predominance for the season, however, continues to favor type B, 59.3% to 40.7%.

The percentage of deaths caused by pneumonia and influenza, which passed the threshold for epidemic of 7.2% back in early January, has been trending downward for the last 3 weeks and was 7.1% as of Feb. 1, according to the influenza division.

ILI-related deaths among children continue to remain high, with a total count of 78 for the season after another 10 deaths were reported during the week ending Feb. 1, the CDC reported. Comparable numbers for the last three seasons are 44 (2018-2019), 97 (2017-2018), and 35 (2016-2017).

The CDC estimates put the total number of ILIs at around 22 million for the season so far, leading to 210,000 hospitalizations. The agency said that it expects to release estimates of vaccine effectiveness later this month.

rfranki@mdedge.com

For the second time during the 2019-2020 flu season, activity measures have climbed into noteworthy territory.

The proportion of outpatient visits for influenza-like illness (ILI) reached its highest December level, 7.1%, since 2003 and then dropped for 2 weeks. Three weeks of increases since then, however, have the outpatient-visit rate at 6.7% for the week ending Feb. 1, 2020, the Centers for Disease Control and Prevention reported. The baseline rate for the United States is 2.4%.

That rate of 6.7% is already above the highest rates recorded in eight of the last nine flu seasons, and another increase could mean a second, separate trip above 7.0% in the 2019-2020 season – something that has not occurred since national tracking began in 1997, CDC data show.

Those same data also show that, from 1997-1998 to 2018-2019, the United States has spent a total of 11 weeks above the 7.0% mark for ILI-related visits.

Another important measure on the rise, the proportion of respiratory specimens testing positive for influenza, reached a new high for the season, 29.8%, during the week of Feb. 1, the CDC’s influenza division said.

Tests at clinical laboratories also show that predominance is continuing to switch from type B (45.6%) to type A (54.4%), the influenza division noted. Overall predominance for the season, however, continues to favor type B, 59.3% to 40.7%.

The percentage of deaths caused by pneumonia and influenza, which passed the threshold for epidemic of 7.2% back in early January, has been trending downward for the last 3 weeks and was 7.1% as of Feb. 1, according to the influenza division.

ILI-related deaths among children continue to remain high, with a total count of 78 for the season after another 10 deaths were reported during the week ending Feb. 1, the CDC reported. Comparable numbers for the last three seasons are 44 (2018-2019), 97 (2017-2018), and 35 (2016-2017).

The CDC estimates put the total number of ILIs at around 22 million for the season so far, leading to 210,000 hospitalizations. The agency said that it expects to release estimates of vaccine effectiveness later this month.

rfranki@mdedge.com

A randomized, controlled trial of Gilead’s antiviral drug remdesivir is currently underway in China in hopes that it will be an effective treatment for the 2019 Novel Coronavirus (2019-nCoV).

dbrunk@mdedge.com

A randomized, controlled trial of Gilead’s antiviral drug remdesivir is currently underway in China in hopes that it will be an effective treatment for the 2019 Novel Coronavirus (2019-nCoV).

dbrunk@mdedge.com

A randomized, controlled trial of Gilead’s antiviral drug remdesivir is currently underway in China in hopes that it will be an effective treatment for the 2019 Novel Coronavirus (2019-nCoV).

dbrunk@mdedge.com