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SARS-
Co
V-2, the virus that causes covid-19. Several studies have reported the more surprising finding that, even if wearers do become infected, their disease is usually milder. Now Joseph Courtney and Ad Bax, a pair of researchers at the National Institutes of Health in Bethesda, Maryland, think they may have worked out why. As they report in the
Biophysical Journal, it comes down to humidity, the immune system, and the protective powers of mucus.
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At first glance, there may not seem much of a mystery to unravel. Masks cut the number of infectious particles entering the nose and mouth. One might expect, therefore, that severe disease would be less likely. But it is not so. One vital factor which predicts disease severity is how far viral particles make it into a person s lungs. Cheap cotton face-masks struggle to block the smallest aerosols, which are the most likely to penetrate deeply. D ....

National Institutes Of Health , United States , Joseph Courtney , National Institutes , Biophysical Journal , தேசிய நிறுவனங்கள் ஆஃப் ஆரோக்கியம் , ஒன்றுபட்டது மாநிலங்களில் , ஜோசப் கோர்ட்னி , தேசிய நிறுவனங்கள் , உயிர் இயற்பியல் இதழ் ,