Jesus Christ, Just Wear a Face Mask!
The conclusion from a recent paper in the Proceedings of the Royal Society A:
We conclude that facemask use by the public, when used in combination with physical distancing or periods of lock-down, may provide an acceptable way of managing the COVID-19 pandemic and re-opening economic activity. These results are relevant to the developed as well as the developing world, where large numbers of people are resource poor, but fabrication of home-made, effective facemasks is possible. A key message from our analyses to aid the widespread adoption of facemasks would be: ‘my mask protects you, your mask protects me’.
From a Reuters report on the paper:
The research, led by scientists at the Britain’s Cambridge and Greenwich Universities, suggests lockdowns alone will not stop the resurgence of the new SARS-CoV-2 coronavirus, but that even homemade masks can dramatically reduce transmission rates if enough people wear them in public.
“Our analyses support the immediate and universal adoption of face masks by the public,” said Richard Stutt, who co-led the study at Cambridge.
A pair of recent papers used the geographic differences in mask usage in Germany to gauge the effectiveness of masks in preventing the spread of Covid-19. Face Masks Considerably Reduce COVID-19 Cases in Germany:
We use the synthetic control method to analyze the effect of face masks on the spread of Covid-19 in Germany. Our identification approach exploits regional variation in the point in time when face masks became compulsory. Depending on the region we analyse, we find that face masks reduced the cumulative number of registered Covid-19 cases between 2.3% and 13% over a period of 10 days after they became compulsory. Assessing the credibility of the various estimates, we conclude that face masks reduce the daily growth rate of reported infections by around 40%.
And Compulsory face mask policies do not affect community mobility in Germany suggests that people don’t go out more or “feel invincible” when they’re wearing masks:
We use anonymised GPS data from Google’s Location History feature to measure daily mobility in public spaces (groceries and pharmacies, transport hubs and workplaces). We find no evidence that compulsory face mask policies affect community mobility in public spaces in Germany. The evidence provided in this paper makes a crucial contribution to ongoing debates about how to best manage the COVID-19 pandemic.
And these are just from the last few days. Why WHY WHY!!!! are we still talking about this? There’s no credible evidence that wearing a mask is harmful, so at worse it’s harmless. If there’s like a 1-in-10 chance that masks are somewhat helpful — and the growing amount of research suggests that both 1-in-10 and “somewhat helpful” are both understatements — isn’t it worth the tiny bit of effort to wear one and help keep our neighbors safe from potential fucking death? Just in case?
I mean, look at where we are as a country right now. Most of the US is reopening while the number of infections continue to rise. Testing is still not where it needs to be in many areas. Tracing and isolation are mostly not happening. According to epidemiologists, those are the minimum things you need to do to properly contain a pandemic like this. Maybe if you’re Iceland you can pooh pooh the efficacy of masks because you test/trace/isolated to near-perfection, but if you’re going to half-ass it like the US has chosen to do, then wearing masks under semi-lockdown conditions is all we have left! Can we do the bare minimum that is asked of us?
Update: And some anecdotal evidence from Missouri: two hairstylists saw 140 clients while symptomatic last month and it resulted in zero infections. Both the hairstylists and their clients wore masks and took other precautions (staggered appointments, chairs spaced apart).
Update: I deleted a reference to this paper that many epidemiologists et al. have flagged as problematic (see here, here, and here for instance). (via @harrislapiroff)
The Masks Masquerade by Nassim Nicholas Taleb is worth a read.
“Libertarians” (in brackets) are resisting mask wearing on grounds that it constrains their freedom. Yet the entire concept of liberty lies in the Non-Aggression Principle, the equivalent of the Silver Rule: do not harm others; they in turn should not harm you. Even more insulting is the demand by pseudolibertarians that Costco should banned from forcing customers to wear mask — but libertarianism allows you to set the rules on your own property. Costco should be able to force visitors to wear pink shirts and purple glasses if they wished.
Note that by infecting another person you are not infecting just another person. You are infecting many many more and causing systemic risk.
Wear a mask. For the Sake of Others.
And finally, obviously, if wearing a mask is not advisable for you — for a genuine medical reason or if it makes you look dangerous to a racist policing system for instance — then you shouldn’t wear one! But the vast majority of us should be able to manage it.
Update: A study in Health Affairs analyzing the infection rates in US states with face mask mandates versus those without finds that a mandate was associated with a decline in the Covid-19 growth rate (italics mine).
Mandating face mask use in public is associated with a decline in the daily COVID-19 growth rate by 0.9, 1.1, 1.4, 1.7, and 2.0 percentage points in 1-5, 6-10, 11-15, 16-20, and 21+ days after signing, respectively. Estimates suggest as many as 230,000-450,000 COVID-19 cases possibly averted By May 22, 2020 by these mandates. The findings suggest that requiring face mask use in public might help in mitigating COVID-19 spread.
In a comparison among countries, those where people wore masks early fared much better than those where people didn’t. This is a pretty stark difference:
And this study noted that Google search volume of people searching for masks in various countries correlated with the infection rate — in general, the earlier the search volume increased in a given country, the fewer infections recorded in that country.
Update: A list of 70 scientific studies, dating all the way back to 2003, that support the wearing of face masks to prevent disease spread.
Bill Nye recently did a quick mask demonstration featuring a candle to show how effective homemade cloth masks are at blocking exhaled breath. He calls wearing a mask in public to protect other people “literally a matter of life and death”.
Stewart Reynolds shares some reasons to not wear a face mask, including selfish syndrome and chronic dickishness.
And this is a sad and all-too-typical American story in four parts. April: I’m not buying a mask; June: crowded pool party; July: complaining about being sick followed by an obituary. We need to fix this, now. People should not be dying like this — this is a 100% preventable death.
Update: The most recent version of an ongoing review of scientific studies about face mask efficacy was recently published online. From the abstract:
We recommend that public officials and governments strongly encourage the use of widespread face masks in public, including the use of appropriate regulation.
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