Twenty different materials put to the test.
The Best Mask or DIY Face Covering for COVID-19
Below is an approximation of this video’s audio content. To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video.
Cloth face coverings are no substitute for actual masks, but may be better than nothing. Let me show you a few studies. This study testing the efficacy of various homemade masks found that scarves, pillowcases, and 100 percent cotton t-shirts were probably the most suitable household materials, blocking various bacteria and viruses about 60 percent as well as surgical masks. As you can see the average filtration efficiency was about 90% or more with surgical masks, compared to more like 50, 60, or 70 percent for the improvised fabrics. Vacuum cleaner bags worked better, right up there alongside surgical masks, but were considerably harder to breathe through, “rendering it unsuitable for a face mask.” The same with the tea towel.
Engineers at the University of Cambridge looked at 20 different options, compared to surgical masks. So, you can see, for example, that lightweight T-shirts have less than half the filtration of heavyweight cotton tees. As you can see, windbreakers and denim jeans are right up there, comparable to surgical masks, alongside the vacuum cleaner bags, but suffer the same problem. They’re “very difficult to breathe through…and are thus ill-suited for face mask construction.” Taking that balance between breathing and filtration into account, the most suitable fabrics for face mask construction may include something like cotton flannel, though in a pinch a single sock pressed tight against the nose and mouth might make a good emergency mask substitute. Regardless of which you use, try not to touch the front of mask while you’re wearing it or when you remove it, then wash your hands. And cloth face coverings should be washed regularly.
Even though face coverings are intended to protect others from the wearer rather than the wearer from others, masks have been recommended for self-protection during the last pandemic for those at high risk in unavoidably crowded settings. In hospital settings, for example, mask wearers appeared to have been comparatively protected from contracting SARS. However, even three or four layers of cloth (in the form of cotton handkerchiefs) only filters a fraction of what a simple surgical mask can block. These are penetration numbers; so, four layers of cotton may only block 4%, 10 times less than a simple surgical mask.
Improvised masks didn’t seem to help in 1918, attributed to the fact that, to get the necessary protective filtration, so many layers of gauze had to be used that breathing was difficult and air leaked around the edges. An improvised face mask should be viewed as the last possible alternative if a supply of commercial face masks is not available.
The World Health Organization still doesn’t think routine mask-wearing in public is necessary, expressing concern that it might lead to a false sense of security and neglect of more important measures such as hand hygiene and social distancing, and may lead to touching one’s face. On the other hand, one could imagine how wearing a mask might prompt people to avoid touching their face. Gloves could play a similar role. Seeing bright purple gloves on your hands can serve as a constant reminder. Here’s me recording the audiobook to How to Survive a Pandemic. Yes, you can still breathe in virus while wearing a mask, and you can still contaminate yourself with gloved fingers, but anything that keeps you constantly conscious about the position of your hands and stops you from touching your face might help.
Speaking of self-conscious, if everyone wore masks in public, symptomatic patients who definitely should be wearing them wouldn’t fear being singled out for stigma. Of course, universal use of face masks in public during a pandemic could only be considered if supplies permit. Sadly, inadequate preparation, misuse, and hoarding have led to a critical shortage of personal protective gear for those on the front line. That’s why the CDC is recommending “cloth face coverings” instead of surgical masks.
You know things are getting desperate when an editorial in the Journal of the American Medical Association entitled “Sourcing Personal Protective Equipment During the COVID-19 Pandemic” includes as a proposed suggestion … “coffee filter masks.”
Surgical masks are usually made out of paper with a gelatinous layer and should be changed every four hours or when they become wet with saliva or other fluid, whichever comes first. Surgical masks, as the name implies, are typically meant to protect others (as in the patient opened up on the operating table). N95 masks, or N95 “respirators” as they’re often called, are the cup-like masks that fit tighter to the face. They are intended to protect the wearer. The WHO and CDC have conflicting guidelines as to what healthcare workers should wear during routine care of patients with COVID-19. The CDC, along with its European counterpart, recommends N95 respirators, whereas the WHO suggests surgical masks are sufficient. While part of the WHO’s reluctance to endorse N95s may be out of a sensitivity to the global scarcity of such resources, the underlying transmission dynamics of the COVID-19 virus remain largely unknown; so, it’s impossible at this time to say which recommendation is right with any certainty.
The relative importance of direct respiratory spread for COVID-19 versus indirect contact via contaminated objects is unclear. For other viral respiratory illnesses like the common cold, breathing appears more important than touching. That’s what that arm brace study showed. For example, in one rhinovirus experiment, only 50 percent of those touching contaminated coffee cup handles became infected. For the flu, the relative importance of transmission continues to be debated, which is remarkable since we’ve known about the virus for nearly a century.
Note that N95 respirators only work at peak efficiency if they conform completely to the face; so, they aren’t for everyone. Even one to two days of stubble may significantly undermine the necessary seal. This is an actual infographic from the CDC showing which types of facial hair may or may not be suitable.
They also must be used properly. In a laboratory setting, N95 respirators have been found to be very effective, but out in the real world, a review of the best science on preventing the spread of respiratory viruses found “no evidence that the more expensive, irritating and uncomfortable N95 respirators were superior to simple surgical masks.” Not that N95s aren’t better at filtration, but perhaps due to poor compliance. I remember how uncomfortable they were when I was working with tuberculosis patients. So, that would support the WHO recommendation that N95s aren’t necessarily better in real world settings, though with proper fitting and compliance they’d presumably come out on top.
Even with the perfect mask sealed over your mouth and nose, your eyes are still exposed, leading to a suggestion that medical workers wear goggles. Monkeys can apparently be infected by dripping the COVID-19 virus into their eyes, but a retrospective study of SARS, at least, found no documented cases of transmission to healthcare workers just because they didn’t use eye protection.
Until we know more about the transmission of this virus, it would seem prudent for those in close contact with coughing patients to err on the side of caution and use both eye protection (like at least a face shield) and N95 respirators. During the SARS outbreak in North America, regular surgical masks were initially recommended, but the advice switched to respirators after doctors started dying.
Here’s how N95 masks compare to various cloth face coverings. Note these are graphs of penetration, so you can see for an N95 mask there’s less than 5% penetration. So, at the particle size at which an N95 mask blocks more than 95%, a mask made out of a t-shirt blocks only about 10%, scarves about 20%, sweatshirts about 30%, and towels closer to 40%.
It’s interesting that the Hanes t-shirts are no better than any of the other t-shirts, but the Hanes sweatshirts appeared to have an edge for some reason. Of course, the study was funded by Hanes—just kidding.
Please consider volunteering to help out on the site.
- Van der sande M, Teunis P, Sabel R. Professional and home-made face masks reduce exposure to respiratory infections among the general population. PLoS ONE. 2008;3(7):e2618.
- Davies A, Thompson KA, Giri K, Kafatos G, Walker J, Bennett A. Testing the efficacy of homemade masks: would they protect in an influenza pandemic?. Disaster Med Public Health Prep. 2013;7(4):413-8.
- O'Kelly E, Pirog S, Ward J, Clarkson PJ. Informing Homemade Emergency Facemask Design: The Ability of Common Fabrics to Filter Ultrafine Particles. medRxiv.org. April 17, 2020.
- Desai AN, Aronoff DM. Masks and Coronavirus Disease 2019 (COVID-19). JAMA. 2020.
- H1N1 Flu | Interim Recommendations for Facemask and Respirator Use to Reduce Novel Influenza A (H1N1) Virus Transmission. Centers for Disease Control and Prevention. September 24, 2009.
- Jefferson T, Del mar C, Dooley L, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses: systematic review. BMJ. 2009;339:b3675.
- Jung H, Kim JK, Lee S, et al. Comparison of Filtration Efficiency and Pressure Drop in Anti-Yellow Sand Masks, Quarantine Masks, Medical Masks, General Masks, and Handkerchiefs. Aerosol Air Qual Res. 2014;14:991-1002.
- 1918 Pandemic Influenza Historic Timeline | Pandemic Influenza (Flu). Centers for Disease Control and Prevention.
- Kellogg WH, Macmillan G. An experimental study of the efficacy of gauze face masks. Am J Public Health (N Y). 1920;10(1):34-42.
- Advice on the use of masks in the context of COVID-19: interim guidance, 6 April 2020. World Health Organization. April 6, 2020.
- Leung CC, Lam TH, Cheng KK. Mass masking in the COVID-19 epidemic: people need guidance. Lancet. 2020;395(10228):945.
- Feng S, Shen C, Xia N, Song W, Fan M, Cowling BJ. Rational use of face masks in the COVID-19 pandemic. Lancet Respir Med. 2020;8(5):434-6.
- Mahase E. Covid-19: hoarding and misuse of protective gear is jeopardising the response, WHO warns. BMJ. 2020;368:m869.
- Cloth Face Coverings: Questions and Answers. Centers for Disease Control and Prevention.
- Livingston E, Desai A, Berkwits M. Sourcing Personal Protective Equipment During the COVID-19 Pandemic. JAMA. 2020.
- Barbosa MH, Graziano KU. Influence of wearing time on efficacy of disposable surgical masks as microbial barrier. Braz J Microbiol. 2006;37(3):216-7.
- Soucheray S. Unmasked: Experts explain necessary respiratory protection for COVID-19. CIDRAP. February 13, 2020.
- Chughtai AA, Seale H, Islam MS, Owais M, Macintyre CR. Policies on the use of respiratory protection for hospital health workers to protect from coronavirus disease (COVID-19). Int J Nurs Stud. 2020;105:103567.
- COVID-19 transmission. World Heart Federation. March 16, 2020.
- Dick EC, Jennings LC, Mink KA, Wartgow CD, Inhorn SL. Aerosol transmission of rhinovirus colds. J Infect Dis. 1987;156(3):442-8.
- Gwaltney JM, Hendley JO. Transmission of experimental rhinovirus infection by contaminated surfaces. Am J Epidemiol. 1982;116(5):828-33.
- Brankston G, Gitterman L, Hirji Z, Lemieux C, Gardam M. Transmission of influenza A in human beings. Lancet Infect Dis. 2007;7(4):257-65.
- Stobbe TJ, Daroza RA, Watkins MA. Facial hair and respirator fit: a review of the literature. Am Ind Hyg Assoc J. 1988;49(4):199-204.
- Sandaradura I, Goeman E, Pontivivo G, et al. A close shave? Performance of P2/N95 respirators in healthcare workers with facial hair: results of the BEARDS (BEnchmarking Adequate Respiratory DefenceS) study. J Hosp Infect. 2020;104(4):529-33.
- Infographic - Facial Hairstyles and Filtering Facepiece Respirators. Centers for Disease Control and Prevention. 2017.
- Lindsley WG, King WP, Thewlis RE, et al. Dispersion and exposure to a cough-generated aerosol in a simulated medical examination room. J Occup Environ Hyg. 2012;9(12):681-90.
- Jefferson T, Del mar CB, Dooley L, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses. Cochrane Database Syst Rev. 2011;(7):CD006207.
- Or PP, Chung JW, Wong TK. A study of environmental factors affecting nurses' comfort and protection in wearing N95 respirators during bedside procedures. J Clin Nurs. 2018;27(7-8):e1477‐84.
- Han Q, Lin Q, Ni Z, You L. Uncertainties about the transmission routes of 2019 novel coronavirus. Influenza Other Respir Viruses. 2020.
- Deng W, Bao L, Gao H, et al. Rhesus macaques can be effectively infected with SARS-CoV-2 via ocular conjunctival route. bioRxiv.org. March 14, 2020.
- Shaw K. The 2003 SARS outbreak and its impact on infection control practices. Public Health. 2006;120(1):8-14.
- COVID-19 Personal Protective Equipment (PPE) for Healthcare Personnel. Centers for Disease Control and Prevention. March 23, 2020.
- Rengasamy S, Eimer B, Shaffer RE. Simple respiratory protection--evaluation of the filtration performance of cloth masks and common fabric materials against 20-1000 nm size particles. Ann Occup Hyg. 2010;54(7):789-98.
- Tanne JH, Hayasaki E, Zastrow M, Pulla P, Smith P, Rada AG. Covid-19: how doctors and healthcare systems are tackling coronavirus worldwide. BMJ. 2020;368:m1090.
- Cowling BJ, Lim WW. They’ve Contained the Coronavirus. Here’s How. The New York Times. March 13, 2020.
Below is an approximation of this video’s audio content. To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring, watch the above video.
Cloth face coverings are no substitute for actual masks, but may be better than nothing. Let me show you a few studies. This study testing the efficacy of various homemade masks found that scarves, pillowcases, and 100 percent cotton t-shirts were probably the most suitable household materials, blocking various bacteria and viruses about 60 percent as well as surgical masks. As you can see the average filtration efficiency was about 90% or more with surgical masks, compared to more like 50, 60, or 70 percent for the improvised fabrics. Vacuum cleaner bags worked better, right up there alongside surgical masks, but were considerably harder to breathe through, “rendering it unsuitable for a face mask.” The same with the tea towel.
Engineers at the University of Cambridge looked at 20 different options, compared to surgical masks. So, you can see, for example, that lightweight T-shirts have less than half the filtration of heavyweight cotton tees. As you can see, windbreakers and denim jeans are right up there, comparable to surgical masks, alongside the vacuum cleaner bags, but suffer the same problem. They’re “very difficult to breathe through…and are thus ill-suited for face mask construction.” Taking that balance between breathing and filtration into account, the most suitable fabrics for face mask construction may include something like cotton flannel, though in a pinch a single sock pressed tight against the nose and mouth might make a good emergency mask substitute. Regardless of which you use, try not to touch the front of mask while you’re wearing it or when you remove it, then wash your hands. And cloth face coverings should be washed regularly.
Even though face coverings are intended to protect others from the wearer rather than the wearer from others, masks have been recommended for self-protection during the last pandemic for those at high risk in unavoidably crowded settings. In hospital settings, for example, mask wearers appeared to have been comparatively protected from contracting SARS. However, even three or four layers of cloth (in the form of cotton handkerchiefs) only filters a fraction of what a simple surgical mask can block. These are penetration numbers; so, four layers of cotton may only block 4%, 10 times less than a simple surgical mask.
Improvised masks didn’t seem to help in 1918, attributed to the fact that, to get the necessary protective filtration, so many layers of gauze had to be used that breathing was difficult and air leaked around the edges. An improvised face mask should be viewed as the last possible alternative if a supply of commercial face masks is not available.
The World Health Organization still doesn’t think routine mask-wearing in public is necessary, expressing concern that it might lead to a false sense of security and neglect of more important measures such as hand hygiene and social distancing, and may lead to touching one’s face. On the other hand, one could imagine how wearing a mask might prompt people to avoid touching their face. Gloves could play a similar role. Seeing bright purple gloves on your hands can serve as a constant reminder. Here’s me recording the audiobook to How to Survive a Pandemic. Yes, you can still breathe in virus while wearing a mask, and you can still contaminate yourself with gloved fingers, but anything that keeps you constantly conscious about the position of your hands and stops you from touching your face might help.
Speaking of self-conscious, if everyone wore masks in public, symptomatic patients who definitely should be wearing them wouldn’t fear being singled out for stigma. Of course, universal use of face masks in public during a pandemic could only be considered if supplies permit. Sadly, inadequate preparation, misuse, and hoarding have led to a critical shortage of personal protective gear for those on the front line. That’s why the CDC is recommending “cloth face coverings” instead of surgical masks.
You know things are getting desperate when an editorial in the Journal of the American Medical Association entitled “Sourcing Personal Protective Equipment During the COVID-19 Pandemic” includes as a proposed suggestion … “coffee filter masks.”
Surgical masks are usually made out of paper with a gelatinous layer and should be changed every four hours or when they become wet with saliva or other fluid, whichever comes first. Surgical masks, as the name implies, are typically meant to protect others (as in the patient opened up on the operating table). N95 masks, or N95 “respirators” as they’re often called, are the cup-like masks that fit tighter to the face. They are intended to protect the wearer. The WHO and CDC have conflicting guidelines as to what healthcare workers should wear during routine care of patients with COVID-19. The CDC, along with its European counterpart, recommends N95 respirators, whereas the WHO suggests surgical masks are sufficient. While part of the WHO’s reluctance to endorse N95s may be out of a sensitivity to the global scarcity of such resources, the underlying transmission dynamics of the COVID-19 virus remain largely unknown; so, it’s impossible at this time to say which recommendation is right with any certainty.
The relative importance of direct respiratory spread for COVID-19 versus indirect contact via contaminated objects is unclear. For other viral respiratory illnesses like the common cold, breathing appears more important than touching. That’s what that arm brace study showed. For example, in one rhinovirus experiment, only 50 percent of those touching contaminated coffee cup handles became infected. For the flu, the relative importance of transmission continues to be debated, which is remarkable since we’ve known about the virus for nearly a century.
Note that N95 respirators only work at peak efficiency if they conform completely to the face; so, they aren’t for everyone. Even one to two days of stubble may significantly undermine the necessary seal. This is an actual infographic from the CDC showing which types of facial hair may or may not be suitable.
They also must be used properly. In a laboratory setting, N95 respirators have been found to be very effective, but out in the real world, a review of the best science on preventing the spread of respiratory viruses found “no evidence that the more expensive, irritating and uncomfortable N95 respirators were superior to simple surgical masks.” Not that N95s aren’t better at filtration, but perhaps due to poor compliance. I remember how uncomfortable they were when I was working with tuberculosis patients. So, that would support the WHO recommendation that N95s aren’t necessarily better in real world settings, though with proper fitting and compliance they’d presumably come out on top.
Even with the perfect mask sealed over your mouth and nose, your eyes are still exposed, leading to a suggestion that medical workers wear goggles. Monkeys can apparently be infected by dripping the COVID-19 virus into their eyes, but a retrospective study of SARS, at least, found no documented cases of transmission to healthcare workers just because they didn’t use eye protection.
Until we know more about the transmission of this virus, it would seem prudent for those in close contact with coughing patients to err on the side of caution and use both eye protection (like at least a face shield) and N95 respirators. During the SARS outbreak in North America, regular surgical masks were initially recommended, but the advice switched to respirators after doctors started dying.
Here’s how N95 masks compare to various cloth face coverings. Note these are graphs of penetration, so you can see for an N95 mask there’s less than 5% penetration. So, at the particle size at which an N95 mask blocks more than 95%, a mask made out of a t-shirt blocks only about 10%, scarves about 20%, sweatshirts about 30%, and towels closer to 40%.
It’s interesting that the Hanes t-shirts are no better than any of the other t-shirts, but the Hanes sweatshirts appeared to have an edge for some reason. Of course, the study was funded by Hanes—just kidding.
Please consider volunteering to help out on the site.
- Van der sande M, Teunis P, Sabel R. Professional and home-made face masks reduce exposure to respiratory infections among the general population. PLoS ONE. 2008;3(7):e2618.
- Davies A, Thompson KA, Giri K, Kafatos G, Walker J, Bennett A. Testing the efficacy of homemade masks: would they protect in an influenza pandemic?. Disaster Med Public Health Prep. 2013;7(4):413-8.
- O'Kelly E, Pirog S, Ward J, Clarkson PJ. Informing Homemade Emergency Facemask Design: The Ability of Common Fabrics to Filter Ultrafine Particles. medRxiv.org. April 17, 2020.
- Desai AN, Aronoff DM. Masks and Coronavirus Disease 2019 (COVID-19). JAMA. 2020.
- H1N1 Flu | Interim Recommendations for Facemask and Respirator Use to Reduce Novel Influenza A (H1N1) Virus Transmission. Centers for Disease Control and Prevention. September 24, 2009.
- Jefferson T, Del mar C, Dooley L, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses: systematic review. BMJ. 2009;339:b3675.
- Jung H, Kim JK, Lee S, et al. Comparison of Filtration Efficiency and Pressure Drop in Anti-Yellow Sand Masks, Quarantine Masks, Medical Masks, General Masks, and Handkerchiefs. Aerosol Air Qual Res. 2014;14:991-1002.
- 1918 Pandemic Influenza Historic Timeline | Pandemic Influenza (Flu). Centers for Disease Control and Prevention.
- Kellogg WH, Macmillan G. An experimental study of the efficacy of gauze face masks. Am J Public Health (N Y). 1920;10(1):34-42.
- Advice on the use of masks in the context of COVID-19: interim guidance, 6 April 2020. World Health Organization. April 6, 2020.
- Leung CC, Lam TH, Cheng KK. Mass masking in the COVID-19 epidemic: people need guidance. Lancet. 2020;395(10228):945.
- Feng S, Shen C, Xia N, Song W, Fan M, Cowling BJ. Rational use of face masks in the COVID-19 pandemic. Lancet Respir Med. 2020;8(5):434-6.
- Mahase E. Covid-19: hoarding and misuse of protective gear is jeopardising the response, WHO warns. BMJ. 2020;368:m869.
- Cloth Face Coverings: Questions and Answers. Centers for Disease Control and Prevention.
- Livingston E, Desai A, Berkwits M. Sourcing Personal Protective Equipment During the COVID-19 Pandemic. JAMA. 2020.
- Barbosa MH, Graziano KU. Influence of wearing time on efficacy of disposable surgical masks as microbial barrier. Braz J Microbiol. 2006;37(3):216-7.
- Soucheray S. Unmasked: Experts explain necessary respiratory protection for COVID-19. CIDRAP. February 13, 2020.
- Chughtai AA, Seale H, Islam MS, Owais M, Macintyre CR. Policies on the use of respiratory protection for hospital health workers to protect from coronavirus disease (COVID-19). Int J Nurs Stud. 2020;105:103567.
- COVID-19 transmission. World Heart Federation. March 16, 2020.
- Dick EC, Jennings LC, Mink KA, Wartgow CD, Inhorn SL. Aerosol transmission of rhinovirus colds. J Infect Dis. 1987;156(3):442-8.
- Gwaltney JM, Hendley JO. Transmission of experimental rhinovirus infection by contaminated surfaces. Am J Epidemiol. 1982;116(5):828-33.
- Brankston G, Gitterman L, Hirji Z, Lemieux C, Gardam M. Transmission of influenza A in human beings. Lancet Infect Dis. 2007;7(4):257-65.
- Stobbe TJ, Daroza RA, Watkins MA. Facial hair and respirator fit: a review of the literature. Am Ind Hyg Assoc J. 1988;49(4):199-204.
- Sandaradura I, Goeman E, Pontivivo G, et al. A close shave? Performance of P2/N95 respirators in healthcare workers with facial hair: results of the BEARDS (BEnchmarking Adequate Respiratory DefenceS) study. J Hosp Infect. 2020;104(4):529-33.
- Infographic - Facial Hairstyles and Filtering Facepiece Respirators. Centers for Disease Control and Prevention. 2017.
- Lindsley WG, King WP, Thewlis RE, et al. Dispersion and exposure to a cough-generated aerosol in a simulated medical examination room. J Occup Environ Hyg. 2012;9(12):681-90.
- Jefferson T, Del mar CB, Dooley L, et al. Physical interventions to interrupt or reduce the spread of respiratory viruses. Cochrane Database Syst Rev. 2011;(7):CD006207.
- Or PP, Chung JW, Wong TK. A study of environmental factors affecting nurses' comfort and protection in wearing N95 respirators during bedside procedures. J Clin Nurs. 2018;27(7-8):e1477‐84.
- Han Q, Lin Q, Ni Z, You L. Uncertainties about the transmission routes of 2019 novel coronavirus. Influenza Other Respir Viruses. 2020.
- Deng W, Bao L, Gao H, et al. Rhesus macaques can be effectively infected with SARS-CoV-2 via ocular conjunctival route. bioRxiv.org. March 14, 2020.
- Shaw K. The 2003 SARS outbreak and its impact on infection control practices. Public Health. 2006;120(1):8-14.
- COVID-19 Personal Protective Equipment (PPE) for Healthcare Personnel. Centers for Disease Control and Prevention. March 23, 2020.
- Rengasamy S, Eimer B, Shaffer RE. Simple respiratory protection--evaluation of the filtration performance of cloth masks and common fabric materials against 20-1000 nm size particles. Ann Occup Hyg. 2010;54(7):789-98.
- Tanne JH, Hayasaki E, Zastrow M, Pulla P, Smith P, Rada AG. Covid-19: how doctors and healthcare systems are tackling coronavirus worldwide. BMJ. 2020;368:m1090.
- Cowling BJ, Lim WW. They’ve Contained the Coronavirus. Here’s How. The New York Times. March 13, 2020.
Republishing "The Best Mask or DIY Face Covering for COVID-19"
You may republish this material online or in print under our Creative Commons licence. You must attribute the article to NutritionFacts.org with a link back to our website in your republication.
If any changes are made to the original text or video, you must indicate, reasonably, what has changed about the article or video.
You may not use our material for commercial purposes.
You may not apply legal terms or technological measures that restrict others from doing anything permitted here.
If you have any questions, please Contact Us
The Best Mask or DIY Face Covering for COVID-19
LicenseCreative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
Content URLDoctor's Note
Here is the whole series so far:
- Where Do Deadly Coronaviruses Like MERS-CoV Come From?
- The SARS Coronavirus and Wet Markets
- Where Did the COVID-19 Coronavirus Come From?
- The Last Coronavirus Pandemic May Have Been Caused by Livestock
- R0 and Incubation Periods: How Other Coronavirus Outbreaks Were Stopped
- Social Distancing, Lockdowns & Testing: How to Slow the COVID-19 Pandemic
- COVID-19 Symptoms vs. the Flu, a Cold or Allergies
- Modifiable Risk Factors and Comorbidities for Severe COVID-19 Infection
- The Immune System and COVID-19 Treatment
- Would Zinc Lozenges Help with COVID-19?
- How to Avoid COVID-19
- Hand Washing & Sanitizing to Inactivate COVID-19 Coronavirus
- What to Do if You Come Down with COVID-19
We’ve looked at the past and how these viruses emerge, then at the present and how to respond to COVID-19. Next we’ll look to the future:
- How COVID-19 Ends: Vaccination, Mutations, and Herd Immunity
- The COVID-19 Pandemic May Just Be a Dress Rehearsal
- How to Prevent the Next Pandemic
You can download the whole series (for free) here and take an even deeper dive in my new book How to Survive a Pandemic (note: all my proceeds from this book are donated to pandemic prevention charities).
If you haven't yet, you can subscribe to our free newsletter. With your subscription, you'll also get notifications for just-released blogs and videos. Check out our information page about our translated resources.