Testing a vaccine on children takes longer and comes with more challenges. But inoculating kids can protect an entire population.
Last December, when Caleb Chung, a 12-year-old in Durham, North Carolina, first heard from his dad that he might be eligible for a local clinical trial of a Covid-19 vaccine, his reaction was a little muted. He was “interested,” he tells me over Zoom. Not excited, exactly, not jumping for joy at the thought of joining the rarefied ranks of the immune. Interested. He had heard about side effects, for one thing, while watching the news with his parents. But mostly he just wasn’t sure what to
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