Tens of thousands of people have volunteered to participate in a COVID-19 vaccine challenge trial being planned by the UK government, which some scientists say is particularly risky because no effective treatment exists for the disease. "This was a way for me to take back control of the situation, to feel like I was in a less hopeless place, and a less hopeless world, and be like, OK, I can do this," said volunteer Estefania Hidalgo.
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