As the first human challenge trials for COVID get under way, here are some firsthand perspectives from people who've taken part in similar research in the past. (I think there's a good case for this sort of thing, though I'm not sure they would have greatly accelerated COVID vaccines specifically.)

Getting Sick for the Sake of Advancing Medical Research
The first Covid-19 human challenge trial has begun in the U.K. Here’s what past trials have been like for participants.
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