Finally a randomised study of N95 vs medical masks
PCR confirmed COVID occurred in 52 of 497 (10.46%) participants in the medical mask group versus 47 of 507 (9.27%) in the N95 respirator group (hazard ratio [HR], 1.14 [95% CI, 0.77 to 1.69]).
https://t.co/6OvApAikmu— Peter Collignon (@CollignonPeter) November 28, 2022
Huh.