Many scientists are recommending that the public wear face masks to fight coronavirus. Here’s the evidence, info on using and making masks, and the not-so-surprising connection to proportional representation of voters:
- Canada’s performance
- Science calling
- Disinfecting and re-using N95 masks
- Homemade masks
- Learn more
- Public policy
Is Canada controlling COVID-19 adequately?
Canada has been doing much better, with the number of daily deaths from COVID-19 decreasing since the beginning of May 2020 to nearly zero by July, while in the world as a whole the number of daily deaths was steady and not decreasing during that period.
Arguably the most reliable measure for international comparisons of success or failure in controlling COVID-19 after it gets started, is the number of days it takes for total COVID-19 deaths to double. By that measure, Canada did poorly compared to the world as a whole for many months, finally catching up to the world average only July 6 2020.
Of people diagnosed with COVID-19, the Canadian death rate is 11% (July 9) and the world death rate 7%.
Scientists are increasingly calling for face mask wearing to beat coronavirus:
COVID-19: “Aerosols can accumulate, remain infectious in indoor air for hours, and be easily inhaled deep into the lungs. For society to resume, measures designed to reduce aerosol transmission must be implemented, including universal masking…”
The first experimental-like evidence confirms that laws requiring face masks in public cripple the virus. Researchers compared regions of Germany with early law adoption, such as Jena, with regions of Germany adopting the law later:
Doctors and scientists call for Alberta to make wearing a mask mandatory in public.
A peer-reviewed study finds wearing of face masks in public is the most effective of all means to prevent COVID-19, and “The current mitigation measures, such as social distancing, quarantine, and isolation implemented in the United States, are insufficient by themselves in protecting the public.”
A review of 172 studies finds face masks, physical distancing, and eye protection reduce the risk of coronavirus infection. Though with low certainty, they estimated mask wearing reduced the chance of infection 85%.
Within households surgical facemasks were 79% effective in preventing transmission of COVID-19.
“there is high-quality, consistent evidence that many (but not all) cloth masks reduce droplet and aerosol transmission”
“our study shows that even face-masks of low efficacy (home-made cloths masks) will lead to a dramatic reduction of disease burden” “This study shows that the use of face-masks in public is always useful”
“wearing a mask appears to be astonishingly powerful, and the cost is nearly zero…And when we compare the level of evidence we have to something like washing hands, it’s vastly, vastly, vastly, vastly higher.”
Weekly increase in deaths, without masks: 40%; with masks: 3%
“These results support the universal wearing of masks by the public to suppress the spread of the coronavirus.”
“..face mask use should be as nearly universal (i.e., nation-wide) as possible and implemented without delay, even if most masks are homemade and of relatively low quality.”
The Czech Republic implemented mandatory mask measures and their fatality rates dropped sharply.
“Areas that have not effectively managed risk, such as New York and Milan, do not have mandated widespread wearing of masks…When masks are worn, they are extremely efficacious.”
“wearing a mask is equally effective or more effective than distancing.”
“..25% to 50% of people with COVID-19 do not have symptoms but may still spread the virus…masking of the public may be beneficial..”
“masking up Canadians is rational and promising to try.”
“health authorities should optimise face mask distribution to..frontline health-care workers and..older adults..and people with underlying health conditions.”
Comparing hand washing, social distancing, and face mask wearing, “Surgical masks or N95 respirators were the most consistent and comprehensive” to reduce the spread of respiratory viruses. (And the advisability of the public wearing ordinary cloth face masks was confirmed in a separate review by 19 scientists April 10, 2020.)
Disinfecting and re-using N95 masks:
N95 masks retained their filtering ability used daily for a month. (Some medical staff in the USA are reusing them for more than 2 weeks.) Do not wash N95 or commercially made surgical masks because this reduces their filtering efficiency. Note that a tight fit around the face is critical; N95 masks are designed to be disposable and if mishandled can easily lose their ability to form a tight fit, so it is recommended to do a User Seal Check each time a mask is donned. (Medical staff require a professional Fit Test, but medium size N95 masks of different brands fit 80 to 95% of users.)
Disinfecting masks from COVID-19 virus:
This is a controversial and rapidly evolving subject. An N95 mask may be oven heated at 70° C (158° F) for 60 minutes (keeping it at least six inches from metal) to decontaminate it from the COVID-19 virus (and many other but not all microbes).
NOTE: One alternative method — leaving masks for 3 days in a warm (22 °C) room — worked in one test but gave only partial decontamination in an experiment with a high viral load. On surfaces, higher temperatures (and possibly high humidity of 80+% RH) are expected to shorten the life of the infectious virus.
(Note: as of July 6th, commercially made dust masks are widely available in Canadian stores at low cost and the rationale for homemade masks is reduced. Woven fabric masks cannot combine breathability and filtration as effectively as the meltblown and spunbonded material used commercially.)
As explained in the “Science calling” section above, homemade masks can make a significant difference in stopping COVID-19. Unlike N95, surgical, and disposable dust masks, homemade masks can be washed for re-use.
What material to use? Various teams have experimented but there is still no standard advice. It has been suggested to use cotton-based material woven densely enough that you cannot see bright light through it, but not so thick that you can’t still breathe through it with acceptable effort if you hold it tightly around your face.
Getting a tight fit is critical; pulling a section cut from pantyhose (nylons) over your head to stretch over your mask can improve the filtration by 15% to 50% by making a tighter fit at the edges of the mask.
Please note, there is a serious risk of doing more harm than good if a person fails to maintain social distancing and hand washing because they think they’re protected by a partially effective mask which they don’t even wear properly. Homemade masks usually filter out less than medical masks.
“According to the U.S. Centers for Disease Control and Prevention, children 2 years and older should wear ‘cloth face coverings’ when they are ‘in the community setting’ to help stop the spread of the coronavirus.”
“Dr. Deborah Gilboa said kids should wear masks whenever they leave the house.”
Where is COVID-19 caught?
Close contacts from overcrowding in workplaces and long term care homes are an obvious risk, but a study in China found almost all infection spread occurred in a home or public transportation. Just a few outbreaks were associated with restaurants (3%), entertainment venues (2%), or shopping (2%). The Canadian Air Transport Security Authority and many bus companies are giving passengers masks.
To fight coronavirus, 137 countries now legally require citizens to wear face masks in certain situations, including 72 countries that require masks be worn everywhere in public (June 3 2020).
Countries with Proportional Representation of voters have been more effective in controlling the novel coronavirus (Joel Selway, Washington Post, May 19, 2020); “health systems in proportional representation countries have a wider geographic distribution of hospitals and medical personnel, less waste and better coordination of the health system across the country.” That’s not a coincidence. Pro Rep attracts better candidates to a more civilized political system, including more women. Pro Rep has been shown to result in better governance generally, including health care, as documented elsewhere here at VotingBC.ca . (The specific connection of Pro Rep to controlling COVID-19 is controversial; an unrefereed model suggests no effect of Pro Rep or women leaders on COVID-19.)
The Trump and Trudeau governments have brushed aside the lack of face mask availability to the public by asking Americans and Canadians to save them for healthcare professionals. However, as the late Justice Archie Campbell wrote: “there is no longer any excuse for governments and hospitals to be caught off-guard and no longer any excuse for health workers not to have available the maximum level of protection through appropriate equipment and training.”
It’s also true that the ultimate way to protect our healthcare workers is to decrease the spread of COVID-19, and that may require the public to be issued masks. Ontario alone had 55 million medical masks that were “expired” and therefore unsuitable for medical personnel, and could have been used to provide every Canadian with one.
On May 9, 2020, the Canadian government announced 8 million masks they received proved slightly substandard to the N95 medical requirement, but instead of purchasing them for the public PM Trudeau announced “we will not be burdened with masks that do not fit our stringent requirements…we will not be paying…“
Japan and S. Korea distributed face masks to every household long ago. Taiwan, Hong Kong and Singapore provided masks for their health care workers as well as their citizens en masse.
Public approval of face masks has been rapidly increasing in Canada and the U.S. as thousands die from the new coronavirus. Epidemic modelling indicates it is important that mask wearing be adopted early in the epidemic rather than later: Universal Masking is Urgent in the COVID-19 Pandemic: SEIR and Agent Based Models, Empirical Validation, Policy Recommendations. The public transit authority has begun giving out 1.5 million free masks to transit customers in Laval and Montreal.
Stopping the virus is the best way to protect our frontline workers in healthcare and essential services.
Until COVID-19 is beat, there’s no doubt we should be increasingly vigilant with our hand washing and social distancing.
The experience of other countries shows we also need more people to use a third weapon, wearing a face mask when out in public.
Let’s do it together! Help spread the word!
#Masks4ALL #FlattenTheCurve #Covid-19