RCT | Medical masks vs. N95 respirators for preventing COVID-19 among health care workers.

Medical Masks Versus N95 Respirators for Preventing COVID-19 Among Health Care Workers: A Randomized Trial – Annals of Internal Medicine

News Release: In some settings, medical masks may offer similar effectiveness to N95 respirators for preventing COVID-19 infection among health care workers – American College of Physicians

Editorial: Comparative Effectiveness of Mask Type in Preventing SARS-CoV-2 in Health Care Workers: Uncertainty Persists – Annals of Internal Medicine

Commentary on Twitter

A randomized trial of medical masks vs N95s in health care workers to prevent Covid https://t.co/CSJkFLE15z
—It's woefully underpowered but ruled out a doubling of hazard for use of medical masks
—In 3 of the 4 countries there was less risk with N95s (p=NS) pic.twitter.com/B7iBvT1J9B

— Eric Topol (@EricTopol) November 28, 2022