Cochrane review: Physical interventions [on the spread of] respiratory viruses

Given Cochrane might be closing after sudden funding cuts, this systematic review from them on mask efficacy might be of interest.

Excerpt:

> Wearing masks in the community probably makes little or no difference to the outcome of laboratory‐confirmed influenza/SARS‐CoV‐2 compared to not wearing masks (RR 1.01, 95% CI 0.72 to 1.42; 6 trials, 13,919 participants; moderate‐certainty evidence). Harms were rarely measured and poorly reported (very low‐certainty evidence).