Over 30,000 persons in 140 countries have volunteered for human challenge trials of Covid-19 vaccines, according to the organization 1Day Sooner. They are willing to be deliberately infected with the Coronavirus after receiving a dose of an experimental vaccine—or a placebo! Human challenge trials could shave weeks or months off the development time for a vaccine, when reducing it by even one day could save thousands of lives. Yet, are such trials ethical?
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