More vaccines have protected monkeys against covid-19, suggesting they might work in people

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Studies on macaques suggest that infection with the coronavirus grants some immunity to catching it again—and that vaccines also seem to offer some protection.

The questions: Does getting infected by the coronavirus make you immune? And can a vaccine do the same job? In two studies published today in Science, a group led by researchers at Harvard University’s Beth Israel Deaconess Medical Center is answering those questions using monkeys called macaques.

Becoming immune: First, the team infected nine monkeys with the coronavirus and they developed pneumonia, like people do. Then, after five weeks, they tried infecting them again, but this time the virus didn’t

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