Facebook X (Twitter) Instagram
    Facebook Instagram Threads
    Global BiodefenseGlobal Biodefense
    Subscribe
    • Featured News
    • Funding
    • Directory
    • Jobs
    • Events
    Global BiodefenseGlobal Biodefense
    Health Security

    Smoke From Wildfires Can Worsen COVID-19 Risk, Putting Firefighters in Even More Danger

    By Luke MontroseSeptember 11, 2020
    Slater/Devil Fires, Happy Camp Crew 2 completing a back burn, September 2020. Credit: U.S. Forest Service Pacific Northwest Region
    Share
    Facebook LinkedIn Reddit Email

    Two forces of nature are colliding in the western United States, and wildland firefighters are caught in the middle.

    Emerging research suggests that the smoke firefighters breathe on the front lines of wildfires is putting them at greater risk from the new coronavirus, with potentially lethal effects.

    At the same time, firefighting conditions make precautions such as social distancing and hand-washing difficult, increasing the chance that, once the virus enters a fire camp, it could quickly spread.

    As an environmental toxicologist, I have spent the last decade expanding our understanding of how wood smoke exposure impacts human health. Much of my current research is focused on protecting the long-term health of wildland firefighters and the communities they serve.

    Air pollution and lingering COVID-19 damage

    People have long understood that the air they breathe can impact their health, dating back more than 2,000 years to Hippocrates in the treatise “On Airs, Waters, and Places.”

    Today, there is a growing consensus among researchers that air pollution, specifically the very fine particles called PM2.5, influences risk of respiratory illness. These particles are 50 times smaller than a grain of sand and can travel deep into the lungs.

    Italian scientists reported in 2014 that air pollutants can increase the viral load in the lungs and reduce the ability of specialized cells called macrophages to clear out viral invaders. Researchers in Montana later connected that effect to wood smoke. They found that animals exposed to wood smoke 24 hours before being exposed to a pathogen ended up with more pathogen in their lungs. The wood-smoke exposure decreased the macrophages’ ability to combat respiratory infection.

    Coronavirus research now suggests that long-term exposure to PM2.5 air pollution, produced by sources including wildfires, power plants and vehicles, may make the virus particularly deadly.

    Scientists at Harvard University’s T.H. Chan School of Public Health looked at county-level data nationwide this spring and found that even a small increase in the amount of PM2.5 from one U.S. county to the next was associated with a large increase in the death rate from COVID-19. While small increases in PM2.5 also raised the risk of death from other causes for older adults, the magnitude of the increase for COVID-19 was about 20 times greater. The results were released before the usual peer review process was conducted, to help warn people of the risks.

    Taken together, these findings suggest that air pollution, including wood smoke, could increase the risk that wildland firefighters will develop severe COVID-19 symptoms.

    Doctors have also found lingering heart and lung damage in some COVID-19 patients, raising additional concerns for people in physically demanding jobs like firefighting.

    Lessons from ‘camp crud’

    The risk of the virus spreading probably doesn’t surprise seasoned firefighters.

    They’re already familiar with “camp crud,” a combined upper and lower respiratory illness accompanied by cough and fatigue that has become common in firefighting camps. The illness seems to ramp up at the end of the season, which is in line with the idea that repeated exposure to smoke may suppress the immune system and make the body more vulnerable to infection.

    Firefighters take a break at a fire camp.
    Fire camps leave little room for social distancing. AP Images/Ted Warren

    Further evidence that wildfire smoke may impact the risk of viral infections can be found in an influenza study that looked at 10 years of air pollution data in Montana. The results indicate that wildfire smoke exposure influences flu rates months later.

    How to protect firefighters from COVID-19

    So, what can be done to avoid the spread of COVID-19 among wildland firefighters?

    Guidance released in May from the National Interagency Fire Center, which coordinates wildland firefighting resources in western states, acknowledges that wildfire smoke “may lead to an increased susceptibility to COVID-19 infection, worsen the severity of the infection, and pose a risk to those who are recovering from serious COVID-19 infection.”

    The National Wildfire Coordinating Group encourages fire teams to make sure personal protective equipment is available and to maintain records of symptoms so illnesses can be tracked and the virus contained.

    Its guidance also calls for camps to be outfitted for better hygiene, such as adding hand-washing stations and mobile shower units, as well as providing access to medical care, making isolation possible and coordinating cross-agency communication about the public health risks. Single-person tents would also allow for more effective social distancing.

    All of that is harder to carry out during quickly changing fire conditions. Fire camps may include hundreds of personnel. One administrative control being implemented is to create firefighter “pods” or small groups that work, eat and bunk together away from other similar pods. This limits opportunities for spreading the virus and makes containment easier if a positive case is identified.

    Camp personnel can also help stop the spread by having coronavirus test kits on hand and following protocols for pre-screening, quarantining and removing infected firefighters from the field.

    Researchers recently modeled the benefits of pre-screening and social distancing for preventing the spread of COVID-19 in fire camps. They found that screening techniques may work for fire camps that are established for a few days, whereas social distancing was more effective in fire scenarios that lasted weeks or months.

    Wildland firefighter numbers are already down in many areas due to pandemic-related complications, but these numbers may become particularly strained as the fire season progresses. There is a fear that COVID-19 cases along with cases of camp crud, which could be mistaken for COVID-19, could severely deplete firefighter numbers.

    The safety of rural western communities depends on the wildland firefighters and their ability to respond to emergencies. Protecting their health helps protect public health, too.

    ABOUT THE AUTHOR

    Luke Montrose, PhD is an environmental toxicologist and an Assistant Professor in the Department of Community and Environmental Health at Boise State University with research interests in public health, epigenetics and chronic illness, particularly as it relates to vulnerable and understudied populations. The Montrose Translational Health Lab works to better understand the molecular basis of toxicant-induced disease risk throughout the lifespan. Recent studies have used cutting edge technology to measure exposure-induced epigenetic changes related to diet, air pollution, heavy metals and endocrine disrupting chemicals. Montrose did his dissertation at the University of Montana on the effects of wood smoke exposure on asthmatic children and the impacts of air filtration interventions, then a postdoc at the University of Michigan to better understand the molecular basis of exposure-induced disease. He is now building a research program to study the long-term health of wildland firefighters.

    This article is courtesy of The Conversation.

    Aerobiology COVID-19 Editor Pick Environmental Flux Epidemiology Frontline Responders Individual Protection Public Health Emergency Toxicology
    Share. Facebook LinkedIn Reddit Email
    Previous ArticleHow Putin Borrowed a Page From Assad’s Chemical Weapon Playbook
    Next Article UT Austin Spearheads Scalable, ELISA Antibody Test for SARS-CoV-2

    Related Stories

    EPA Developing AMR Risk Framework for Antibacterial and Antifungal Pesticides

    September 29, 2023

    Provide Feedback on Federal DURC Biosafety Oversight of Potential Pandemic Pathogens

    September 24, 2023

    Committee to Examine Transmission and Geographic Spread of Chronic Wasting Disease

    September 24, 2023

    New Method Improves Quantification of Ricin in Complex Matrices

    September 20, 2023
    News Scan

    Biodefense Headlines – 19 September 2023

    News Scan September 19, 2023

    News highlights on health security threats and countermeasures curated by Global Biodefense This week’s selections include a global survey of gain-of-function research; funding of an mRNA mpox vaccine; Nipah virus outbreak in India; field detection of threat agents with acoustic…

    Upcoming Events

    Oct 3
    Virtual Event Virtual Event
    October 3 - October 5

    OneLab Summit 2023

    Oct 3
    Virtual Event Virtual Event
    12:00 pm - 2:00 pm EDT

    Public-Private Partnerships to Distribute, Dispense, and Administer Medical Countermeasures

    Oct 4
    Virtual Event Virtual Event
    10:00 am - 2:00 pm EDT

    Tunneling Nanotubes and Intracellular Protrusions Workshop

    Oct 12
    Virtual Event Virtual Event
    12:00 pm - 2:00 pm EDT

    Public-Private Partnerships for Acceptance and Uptake of Medical Countermeasures

    View Calendar

    Subscribe to Global Biodefense

    Get the latest news on pathogens and preparedness

    © 2023 Stemar Media Group LLC
    • About
    • Contact
    • Privacy
    • Subscribe

    Type above and press Enter to search. Press Esc to cancel.