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Per viral epidemiology expert @mlipsitch, we can't be sure that "achievable" vaccination levels (~75%) will offer herd immunity, but they will drastically reduce mortality. ccdd.hsph.harvard.edu/2020/12/17/covid-19-vaccines-and-herd-immunity/Permalink On twitter.com
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Post offers a detailed summary, for the algebra-literate, of the remaining unknowns about COVID infection and transmission, vaccine effectiveness.On twitter.com