What effects does one have mask on the Coronavirus epidemic? Do you really need to wear it? For those who are still skeptical – and there are many just see the photos in the Italian beaches where practically nobody wears a protection – here is the experiment of Richard Davis, Director of the clinical microbiology laboratory at the Providence Sacred Heart Medical Center in Spokane, Washington. The professor demonstrated what it means to wear a mask. And his test went viral.
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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
«What does a mask do – wrote Davis on Twitter -? Blocks respiratory droplets from the mouth and throat. Two simple demonstrations: first, I sneezed, sang, spoke and coughed towards an agar culture plate with or without a mask. The colonies of bacteria show where the droplets have landed. A mask blocks practically all of them ». Obviously in this case it is bacteria that are normally present in people’s respiratory droplets (large and heavy ones) and it is not SARS-CoV-2 virus, but you can see how a surgical mask blocks most of the droplets.
The second demonstration explains the relevance of the spacing together with the effectiveness of the masks. “I put the open bacterial culture plates 2, 4 and 6 feet apart and coughed for about 15 seconds. I repeated the experiment without a mask, “writes the doctor. The distances are 60 cm, 120 and 180. As can be seen from the number of colonies of bacteria, the droplets have mostly landed at distances below 180 cm, but the mask has blocked almost all of them. Davis recalls that there is nothing “scientific” in his demonstration but “the colonies of normal bacteria that come from my mouth / throat – he writes – show the dynamics of the spread of large respiratory droplets, like the ones we think mainly spread the # COVID19 and how a mask can block them! ».
Last updated: June 29, 12:53 am
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