AstraZeneca COVID-19 Vaccine Trial on Hold

AstraZeneca COVID-19 Vaccine Trial on Hold
(AP Photo/Alastair Grant)

A large, Phase 3 study testing a Covid-19 vaccine being developed by AstraZeneca and the University of Oxford at dozens of sites across the U.S. has been put on hold due to a suspected serious adverse reaction in a participant in the United Kingdom.

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