![]() ![]() Richard Davis conducted two demonstrations about how face masks block respiratory particles. Given what we know about how the coronavirus spreads, isn't that reason enough to keep your face mask handy? Dr. And, he clearly shows that the use of a mask will block almost all of that liquid. Davis does show us just how much liquid comes out of our mouths-even when simply talking. But we don't know how much of the virus or what type of virus. He only looked at bacteria and then inferred that viruses would also be included in the mix. ![]() When people want to know the effectiveness of different types of masks, they're essentially looking for information on how much of the virus is blocked. They also show how a face covering blocks most of those droplets. While he hasn't tried it, he said that he would expect that the outcome would be “essentially the same.” That's because his demonstrations show how talking, sneezing, etc make droplets come out of your mouth and that these droplets carry bacteria. Davis' followers asked if the results would be different if he tested different types of masks. “B acteria are incredibly different from viruses! But since we expect respiratory droplets to be what primarily spreads #COVID19, I exploit the presence of (easily to grow and visualize) bacteria in respiratory droplets, to show where they go,” he explains. Of course, Davis reminds us that these demonstrations do not show the spread of viruses like COVID-19. So, it looks like face masks are two for two. Masks keep your respiratory secretions to yourself! no mask demonstrations got perfectly summarized in this brief 34 second video. While most droplets hit the plate when he was less than six feet away, a face mask blocked nearly all of them-no matter the distance. Again, the results are clearly in favor of a face mask. Placing bacteria culture plates two, four, and six feet away, he coughed hard for about 15 seconds both with and without a mask. Davis looked at distance, as this is the other common method of keeping the coronavirus from spreading. ![]() Meanwhile, the masked cultures were basically clean.įor the second demonstration, Dr. Coughing gave a similar effect and even singing and talking for one minute caused bacteria transfer. Just one sneeze without a mask fills the culture with bacteria colonies that form where the respiratory droplets fell. In the first demo, he placed agar cultures close to his face to show how many respiratory particles transferred while talking, singing, sneezing, and coughing with and without a face mask. After seeing a lot of misinformation about the dangers and usefulness of face masks, he decided to do a demonstration. Richard Davis is the Clinical Microbiology Lab Director at Providence Sacred Heart Medical Center in Spokane, Washington. ![]()
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