A: Three: from Pfizer-BioNTech, Moderna and Johnson & Johnson. Pfizer’s was the first, in December, with Moderna’s following shortly after; each is given in two shots spaced three to four weeks apart. Johnson & Johnson’s vaccine, authorized last month, is given in one dose.
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March 15, 2021 at 03:46AM
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Coronavirus vaccines: What’s available in US and what's coming next - Chicago Tribune
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