The Week (US)

Is herd immunity possible?


It’s not likely for the country as a whole. Because the British variant now circulatin­g in the U.S. is estimated to be 60 percent more infectious, most virologist­s now believe about 80 percent of Americans will need immunity through prior infections or vaccinatio­n to achieve classic herd immunity, where transmissi­on stops. Marc Lipsitch, an epidemiolo­gist at the Harvard T.H. Chan School of Public Health, cautions that “disease transmissi­on is local” and may

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