herd immunity , n :
(epidemiology) The protection given to part of the surviving community against an epidemic of a contagious disease when a significant number of the population are immunized or develop immunity if they survive from the disease. Today is recognized by the United Nations as World Health Day to draw attention to global health issues.
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Wuhan lab staff sought hospital care before Covid-19 outbreak disclosed 39 by pseudolus | 10 comments on Hacker News.
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By BY MAGGIE ASTOR AND NICK CORASANITI from NYT U.S. https://ift.tt/35D0FNL
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