AstraZeneca's COVID-19 vaccine trial has been stopped after an illness. Here's what it means.

AstraZeneca's COVID-19 vaccine trial has been stopped after an illness. Here's what it means.

USATODAY.com

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The hold AstraZeneca placed Tuesday on its COVID-19 vaccine trials is the first major setback in pursuit of a vaccine. Such setbacks aren't uncommon.

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