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Published on: 28/06/2020 21:35
“What does a mask do? It blocks respiratory droplets from the mouth and throat.” Professor Richard Davis, director of the clinical microbiology laboratory at the Providence Sacred Heart Medical Center in Spokane, Washington state, with elementary evidence highlighted the importance of using the mask. He documented his test on Twitter and achieved an amazing success, with hundreds of thousands of retweets and likes. “Two simple examples. The first: I sneezed, sang, spoke and coughed towards an agar culture plate with or without a mask. Colonies of bacteria show where the droplets have fallen. A mask basically blocks them “, he writes by publishing eloquent photos: the plates not protected by the masks show a clearly superior bacterial presence The experiment does not refer to the presence of Covid-19 in the droplets but of generic bacteria in the ‘droplets’. On Twitter, The experiment is a huge success and Davis has to answer dozens of comments and questions. “It is 100% true – he says answering a user -. Bacteria are incredibly different from viruses. But since it is believed that Covid-19 spreads mainly through droplets, I exploit the presence of bacteria in droplets to show where they are going. “Davis, who recognizes the empirical nature of the test, used a surgical mask. The scientist, as documented by another photo, he also performed a further test: he coughed “violently” at different distances from the plates. First with the mask, then without. Also in this case, the protective device it worked.
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
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