WASHINGTON, Sept. 23 (Xinhua) -- A fourth Phase 3 clinical trial evaluating an investigational COVID-19 vaccine has begun enrolling adult volunteers, the U.S. National Institutes of Health (NIH) announced on Wednesday.
The trial is designed to evaluate if the investigational Janssen COVID-19 vaccine JNJ-78436725 can prevent symptomatic COVID-19 after a single dose regimen, the NIH said in a release.
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