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Why human challenge trials for a COVID-19 vaccine are worth the risks

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Human trials of coronavirus vaccine candidates involve volunteers knowingly exposing themselves to a virus that has killed more than 300,000 people worldwide. NEW YORK - A human challenge trial of a coronavirus vaccine candidate involves volunteers knowingly exposing themselves to a virus that has killed more than 300,000 people worldwide.

A human challenge trial, though potentially dangerous for the volunteers, is one of the best ways to ensure that a vaccine actually works.

And yet human challenge trials were so effective in fighting other deadly diseases that researchers believe the risk is worth it.

Vaccine human challenge trials have been used for other diseases, too, such as malaria, typhoid, and Dengue fever, according to Josh

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