The number of confirmed U.S. coronavirus cases has officially topped 2 million as states continue to ease stay-at-home orders and reopen their economies and more than a dozen see a surge in new infections. “I worry that what we’ve seen so far is an undercount and what we’re seeing now is really just the beginning of another wave of infections spreading across the country,” says Dr. Craig Spencer, director of global health in emergency medicine at Columbia University Medical Center.

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