The idea sounded counterintuitive, but by carefully dosing individuals with SARS-CoV-2 in a controlled setting, scientists could study how the virus affects the body and learn what factors may offer protective benefits.
These types of studies, called human challenge trials, could help fast-track understanding the deadly virus devastating the world, experts claimed. Others, though, questioned whether the potential benefits were worth the risk, particularly given the host of unknowns surrounding Covid-19, and the lack of available treatments at the time.
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