A guide to how — and when — a Covid-19 vaccine could be cleared

A guide to how — and when — a Covid-19 vaccine could be cleared

A layperson’s guide to how — and when — a Covid-19 vaccine could be authorized 

By MATTHEW HERPER

JIM WATSON/AFP VIA GETTY IMAGES

A rundown of the science that goes into the decision-making process and what it tells us about when results could be available.

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