This Is Definitive On Masks

The Journal of the American Medical Association has a short article saying that the evidence is strong for wearing masks in public.

There is good evidence that masks help both in keeping viruses from being spread by the wearer and also in preventing the wearer from breathing viruses in. Further, wearing a mask does little harm, which is greatly outweighed by the benefit of reducing transmission.

Some selections:

After emerging data documented transmission of SARS-CoV-2 from persons without symptoms, the recommendation was expanded to the general community, with an emphasis on cloth face coverings that could be made more widely available in the community than surgical masks and to preserve personal protective equipment such as N95 respirators to the highest-risk exposures in health care settings. Now, there is ample evidence that persons without symptoms spread infection and may be the critical driver needed to maintain epidemic momentum.

…recent research of household textiles’ performance when used as source control suggests cloth face coverings may be able to do so with acceptable efficiency and breathability.

Like herd immunity with vaccines, the more individuals wear cloth face coverings in public places where they may be close together, the more the entire community is protected. Community-level protection afforded by use of cloth face coverings can reduce the number of new infections and facilitate cautious easing of more societally disruptive community interventions such as stay-at-home orders and business closings.

At this critical juncture when COVID-19 is resurging, broad adoption of cloth face coverings is a civic duty, a small sacrifice reliant on a highly effective low-tech solution that can help turn the tide favorably in national and global efforts against COVID-19.

The article is easy to read and gives examples with references. Check it out.

Cross-posted to Balloon Juice