Are children a major source of contagion for Covid-19? Ten months into a pandemic that has claimed 1.2 million lives experts are still divided on the question, even as governments must decide whether to keep classrooms open or shut.
During the first wave of infection, scientific consensus formed around the concern that children might be a crucial vector — as they are for the flu — in spreading the new coronavirus.
And then, moving into the summer, the opposite idea took hold: kids, especially young ones, did not infect others that much, several studies suggested.
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