Science shows face masks help reduce Covid spread

Just had one of those silly Twitter “conversations” with someone who had position so fixed, impossible to change with facts. Yeah, reminds me of adage “Don’t mud wrestle with a pig. The pig enjoys it, and you just get dirty.” But, kind of interesting to see how someone set in ideas can’t be swayed – a fact resistant human, as I noted in a tweet.

An anti-masker, as you’ve guessed by now. In one tweet, wrote, “Would serve you well to take on some actual science on the subject. This anti-scientific stance is not leading to a productive conversation.”

Well, I’d already given a couple of links to studies, ie science; but this time I responded with plenty more, and now using for this post.

Science shows masks do work; even if not 100%. And best masks are something like N95 with loops around back of head, apparently, or even better. Followed by KF94 [I use a lot, quite comfortable]; with something like a big fall in efficacy to surgical paper masks, and even cloth masks. Here, then, some snippets from and links to various studies, science articles:

Masks Are a Proved Way to Defend Yourself from Respiratory Infections Respiratory viruses have rebounded hard after COVID seclusion, and masks are one of the best ways to avoid getting them

Masks Are a Proved Way to Defend Yourself from Respiratory Infections

the ratio of incident risk for masked vs. non-masked populations still shows a benefit of wearing masks even with the higher R0 variants.

Evaluation of different types of face masks to limit the spread of SARS-CoV-2: a modeling study

several personal protective and social measures, including handwashing, mask wearing, and physical distancing are associated with reductions in the incidence covid-19.

Effectiveness of public health measures in reducing the incidence of covid-19, SARS-CoV-2 transmission, and covid-19 mortality: systematic review and meta-analysis

Researchers found that surgical masks impede the spread of COVID-19 and that just a few, low-cost interventions increase mask-wearing compliance.

Surgical masks reduce COVID-19 spread, large-scale study shows

When masks are worn and combined with other recommended mitigation measures, they protect not only the wearer but also the greater community. 

https://jamanetwork.com/journals/jama/fullarticle/2776536

face masks can indeed play a crucial role.

Face masks play a crucial role, new COVID research confirms

Even moderately effective face masks can play a role in reducing the spread of COVID-19,

Effectiveness of Face Masks in Reducing the Spread of COVID-19: A Model-Based Analysis

“Our results show that interventions such as mask-wearing and social distancing are effective at limiting the spread of respiratory disease,”

Long-term population benefits of wearing masks for endemic infections depend on the biology of transmission and immunity

Can face masks help slow the spread of the virus that causes coronavirus disease 2019 (COVID-19)? Yes.


How well do face masks protect against COVID-19?

Well, all this science didn’t sway the anti-masker, who replied: “Nonsense. Masks have been subject to RCTs long before covid. No real efficacy has ever been determined. Also there is zero difference in the prevalence of respiratory disease in traditional mask wearing countries like Japan, compared to zero mask countries. Masks are a mirage.”

What a lot of codswallop! – unsupported, you may notice, by any actual links to science… So I’ve had a look online, for more info; and found this lengthy review paper, which includes:

A Cochrane review on physical interventions to interrupt or reduce the spread of respiratory viruses included 67 RCTs and observational studies. It found that “overall masks were the best performing intervention across populations, settings and threats.”
… Randomized control trial evidence that investigated the impact of masks on household transmission during influenza epidemics indicates potential benefit. 

… Overall, direct evidence of the efficacy of mask use is supportive, but inconclusive.

… Our review of the literature offers evidence in favor of widespread mask use as source control to reduce community transmission …. When used in conjunction with widespread testing, contact tracing, quarantining of anyone that may be infected, hand washing, and physical distancing, face masks are a valuable tool to reduce community transmission. 

An evidence review of face masks against COVID-19

As to Japan, well that info is wrong too:

The Japanese have a long and well-established tradition of wearing masks, which has proven to be effective in mitigating the spread.
… Among G7 countries, the mortality gap between American and Japanese mortality is remarkably large.

Japan and US are worlds apart on pandemic mortality

Of course, no stopping the dyed-in-the-wool anti-masker with anything like actual science; response was “There has NEVER been a lower prevalence in respiratory diseases in Japan or anywhere else where masks have been worn as part of some social custom compared to other places.” Readily found:

Here, we provide our experience through the flu season of 2020/2021 in Japan, which underscores the importance of wearing masks to prevent coinfection of influenza and COVID-19.
… it appears that wearing masks, coupled with improvements in hygiene practices, likely contributed to the drastic decline in influenza cases, thereby minimizing co-infection.

Wearing a mask does indeed matter: Lessons from the 2021 influenza infection season

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