Why Is It So Hard to Study COVID Vaccines' Rare Side Effects?

Why Is It So Hard to Study COVID Vaccines' Rare Side Effects?
(Darryl Dyck/The Canadian Press via AP)

In mid-March, several European countries paused distribution of the COVID-19 vaccine made by the University of Oxford, UK, and the pharmaceutical firm AstraZeneca, following reports that some people had developed blood-clotting disorders after receiving the jab.

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