A Single Vaccine Dose Appears To Protect Against COVID-19. So Why Are We Giving Two?

Tucked inside the Food and Drug Administration’s analyses of Moderna and Pfizer’s vaccines was a pleasant discovery: A single injection of either of the two-dose vaccines appears to provide strong protection against the coronavirus. With supplies of the vaccines limited — and hundreds of millions of people waiting for inoculation — this leaves epidemiologists grappling with a complicated question. Should …

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