What Does A Mask Do Blocks Respiratory Droplets Coming From

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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. pic.twitter.com/ETUD9DFmgU

— Rich Davis, PhD, D(ABMM), MLS🧫🦠 (@richdavisphd) June 26, 2020