One Company Halted Its COVID-19 Vaccine Trials After a Possible Serious Adverse Reaction

have been halted due to a possible serious adverse reaction. The company is now investigating whether or not the issue is directly related to the vaccine.

AstraZeneca's COVID-19 vaccine, which is being developed with researchers at Oxford University, is one of just a few candidates that's in Phase 3 trials in the U.S. right now, meaning it is one of those furthest along in the testing process. Previously, the vaccine had been in testing in combined Phase 2 and 3 trials in the U.K. and Brazil as well as a combined Phase 1 and 2 trial in South Africa. But after a trial participant in the U.K.

There aren't a ton of public details about the participant's condition or the timing of their diagnosis, but the

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