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Why the Covid-19 Vaccine Is More Scarce Than the Flu Shot - The Wall Street Journal

Full immunization against Covid-19 requires two shots, compared with one for the flu. An inoculation in Portola Valley, Calif., last month.

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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