@mjb302
RT @EricTopol: The use of high-quality masks (like N95/KN95 respirators) by patients, compared with surgical masks, substantially reduced Covid infections among nearly 4,000 health care workers
https://t.co/Ta5sfucD4V @JAMANetworkOpen

🐦🔗: https://nitter.eu/NChildersMEP/status/1559257069961748486