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The hope is that a person who has recovered from COVID-19 would have some protection against reinfection in the future. Here's what researchers do — and don't — know.

Some state exchanges have begun allowing new enrollment to help ease consumers' worry about health care costs. It's also so the uninsured won't inadvertently spread the coronavirus by avoiding care.

"Neither President Trump nor Vice President Pence had close contact with the individual," Pence spokeswoman Katie Miller said in a statement.

"Clearly, by the end of April, our health care system will collapse," said Brazil's Health Minister, Luiz Henrique Mandetta. Confirmed cases surged by 283 in one day to 904.

The world's fourth most populous country is bracing for a spike in cases of coronavirus infection, after health experts say a sluggish government response has masked the serious of the outbreak.

"We know this will be hard," Gov. J.B. Pritzker said in a news conference, adding that the new rules are expected to last until April 7.

About half of U.S. rural hospitals operate in the red on a good day. Now facing a pandemic, hospital CEOs warn that, without federal help, their doors may close when the community most needs them.

Countries are doing everything from closing schools to banning weddings. But there is concern about the toll on fragile health-care systems, livelihoods and people with HIV, TB and malaria.

It's too soon to know if the antiviral compound tested in 2014 as a potential Ebola treatment will hobble the coronavirus. Lab tests show promise, but studies in people with COVID-19 have only begun.

People with compromised or supressed immune systems are especially vulnerable to the coronavirus. They are figuring out how to get by during this time of heightened concern about infections.