FDA: Only N95s Nearly 100% Effective, But Cloth Masks Still Helpful

A recently developed FDA risk assessment tool shows that while N95 masks are the most effective at protecting the wearer from COVID-19 viral droplets, homemade facial coverings still help flatten the COVID-19 curve. According to Suvajyoti Guha, a mechanical engineer at FDA’s device center, a single layer of most household fabrics, such as t-shirts and scarves, can stop respiratory droplets larger than .5 microns. However, Guha reported at FDA’s Thursday (Nov. 12) virtual Grand Rounds webinar that a single layer...