“There is a substantial probability that normal speaking causes airborne virus transmission in confined environments.' A new study adds to a growing body of research on why it’s important that people maintain social distancing and wear masks.
That’s the conclusion of a new study released Thursday published in the peer-reviewed Proceedings of the National Academy of Sciences, the official journal of the National Academy of Sciences. “These observations confirm that there is a substantial probability that normal speaking causes airborne virus transmission in confined environments,” the study concludes.
In a closed, stagnant-air environment, they disappear from view after 8 minutes to 14 minutes, “which corresponds to droplet nuclei of ca. 4um diameter, or 12um to 21um droplets prior to dehydration,” the researchers wrote. One micrometer, um, is equivalent to one millionth of a meter. The coronavirus is 0.125 um. Medical-grade N95 masks are worn by medics because they can block particles of that size.
“ Room ventilation, open space, sanitization of protective apparel, and proper use and disinfection of toilet areas can help reduce droplet spread. ” The number of cases, meanwhile, continues to rise. As of Thursday, nearly 10 million people had been tested in the U.S. for SARS-CoV-2. There were 1,398,393 confirmed cases, and 84,575 deaths in the U.S., of which 27,477 were in New York. Worldwide, there were 4,399,550 confirmed cases and 299,333 deaths, according to Johns Hopkins Whiting School of Engineering.
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