Vaccinating children is viewed as an important increase to the level of immunity in a population, driving down the number of cases broadly, while offering protection to more people.

While risk of severe illness in youngsters is low compared with that in adults, the coronavirus has infected more than 1.5 million children and sent more than 13,000 to hospitals, more than are hospitalized for flu in an average year, according to data collected by the C.D.C.

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