we need far more human challenge trials, and far less garbage people like ethicists.

In interviews, former challenge trial participants described motives for their participation that ranged from the light-hearted — several imagined it would be a fun story to tell at scientific conferences and parties — to the serious. Some spoke of altruistic motives, often shaped by personal experiences. “I spent a couple years in Africa; I was in the Peace Corps. I think for me, seeing that firsthand, and knowing that there might be some way that maybe I can be a part of figuring out whether or not we can make a vaccine for malaria definitely played a big part in it for me.”

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