Controversial ‘human challenge’ trials for COVID-19 vaccines gain support

Jul 22, 2020

Some researchers have advocated a fast way to determine whether a COVID-19 vaccine works: Intentionally attempt to infect vaccinated volunteers with the virus, SARS-CoV-2. Ethicists and vaccine scientists alike raised red flags, and the discussion has remained mostly theoretical. But now two key elements are taking shape: a large corps of volunteers willing to take part in a “human challenge” trial, and the well-understood lab-grown virus strains needed for the studies. Science


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