The C.D.C. updates its definition of ‘close contact’ in relation to infection risk. October 22, 2020 at 05:15AM

The C.D.C. updates its definition of ‘close contact’ in relation to infection risk. October 22, 2020 at 05:15AM

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By BY GINA KOLATA from NYT World https://ift.tt/3jkCx9e
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