A Physician’s Primer on Covid-19, Clotting, and Causality

How to make sense of recent concerns about the AstraZeneca vaccine

Photo: Andriy Onufriyenko/Getty Images

Last week, several European countries paused their use of the AstraZeneca vaccine due to concerns about clotting and bleeding risks. Though the World Health Organization (WHO) and European Medicines Agency (EMA) have both said that it is safe to use, most…

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