Joseph G. Allen is an associate professor and director of the Healthy Buildings program at Harvard University’s T.H. Chan School of Public Health. Michael Mina is an assistant professor of epidemiology at the Chan School and assistant professor of pathology at Harvard Medical School.

Let’s make one thing clear: Covid-19 cases in the United States will likely rise in the fall and early winter. Coronaviruses are seasonal; this virus is no different.

As a result, the United States may be tempted to close schools in response, as recently happened in Britain and Singapore. That would be a mistake. Here’s what we can do to ensure it doesn’t happen.

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