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So what they found is that if you have an infected person with direct contact with somebody else for 20 minutes, the risk of transmission with surgical masks was 10.4%. With an N95 without a nose piece, it was 4.2%. And an N95 with a nose piece—in other words, a good seal—0.
14%.
Monica Gandhi MD, MPH
N95s Reduce COVID Transmission Drastically More Than Surgical Masks
COVID Part 2: Masks, long COVID, boosters, mandates, treatments, and more
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