The White House released models that project a stunning toll: millions of coronavirus cases and between 100,000 and 200,000 deaths in the U.S.

The C.D.C. is considering telling many more people to wear masks.

March ended as the worst month on Wall Street since 2008, with the S&P 500 index down 12.5 percent.

Close to home: Gov. Andrew M. Cuomo of New York says his brother Chris Cuomo, the CNN anchor, has the virus.

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It may be time for everyone to mask up

The Centers for Disease Control and Prevention is having second thoughts about masks.

For weeks, it (and we) said that ordinary citizens in the U.S. did not need to wear them unless they were sick and coughing or were caring for someone who was.

Now, with the number of cases in the U.S. doubling every three or four days, it looks as though that may not have been the best advice.

New data cited by Dr. Robert Redfield, the director of the C.D.C., shows high rates of transmission by people who are infected but don’t know it yet. An infected person can be contagious for 48 hours before developing symptoms, if they get them at all. Having a mask on could cut down on the number of transmissions from asymptomatic people.

So the C.D.C. is now considering whether to recommend that more people — maybe everybody — wear a mask when out in public.