Three more states join California in telling nonessential workers to stay home

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As thousands more Americans get tested, the number of reported coronavirus cases has climbed to more than 18,000. At least 242 people in the US have died.

Dr. Deborah Birx, coordinator of the White House coronavirus task force, told CNN's Wolf Blitzer that between 9 and 11% of Americans who have been tested get a positive result. That would mean at least 180,000 people in the United States have been tested. There also are samples that are part of a backlog of tests that need to be examined this weekend, she said.