covid: masks work, yet again
A report by the CDC confirmed that indoor mask use decreased SARS-CoV-2 transmission, with the N95/KN95 outperforming surgical masks ( see https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8830622/ ). Details: -- test-negative case-controlled study of randomized California residents receiving SARS-CoV-2 tests between Feb 18 and Dec 1, 2021 -- face mask or respirator use was assessed in participants who were positive for SARS-CoV-2 vs matched control participants who had negative SARS-CoV-2 tests and had been in indoor settings (retail stores, restaurants and bars, recreational facilities, public transit, salons, movie theaters, religious services, schools, or museums) in the prior 14 days and had no known contact with anyone with confirmed or suspected SARS-CoV-2 infection during that time -- 1528 case-participants ( SARS-CoV-2 positive) were compared to 1511 control patients, matched by age group, sex, and state region ; all this from a total of 1...