Rich Davis, PhD, D(ABMM), MLS 🦠🔬🧫 (@richdavisphd) Tweeted:
What does a mask do? Blocks respiratory droplets coming from your mouth and throat.
Two simple demos:
First, I sneezed, sang, talked & coughed toward an agar culture plate with or without a mask. Bacteria colonies show where droplets landed. A mask blocks virtually all of them. https://t.co/ETUD9DFmgU