Full immunization against Covid-19 requires two shots, compared with one for the flu. An inoculation in Portola Valley, Calif., last month.
Photo: Rachel Bujalski for The Wall Street Journal
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Full immunization against Covid-19 requires two shots, compared with one for the flu. An inoculation in Portola Valley, Calif., last month.
Photo: Rachel Bujalski for The Wall Street Journal
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