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With a coronavirus vaccine still months off, companies are rushing to test what may be the next best thing: drugs that deliver antibodies to fight the virus right away, without having to train the immune system to make them.

What role children play in the coronavirus pandemic is the hot-button question of the summer. “There are still a lot of unanswered questions. That is the biggest challenge,” said Dr. Sonja Rasmussen, a pediatrics professor at the University of Florida.

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Can you get the coronavirus twice? Health experts think people who had COVID-19 will have some immunity against a repeat infection. But they don't know how much protection or how long it would last.