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The C.D.C. updates its definition of ‘close contact’ in relation to infection risk.


By BY GINA KOLATA from NYT World https://www.nytimes.com/live/2020/10/21/world/covid-19-coronavirus-updates/the-cdc-updates-its-definition-of-close-contact-in-relation-to-infection-risk?partner=IFTTT
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