How a California woman went untested for coronavirus for 4 days
A person wearing a protective mask sits in a Bay Area Rapid Transit (BART) train car in San Francisco on Feb. 26, 2020. (David Paul Morris/Bloomberg via Getty Images)
A person wearing a protective mask sits in a Bay Area Rapid Transit (BART) train car in San Francisco on Feb. 26, 2020. (David Paul Morris/Bloomberg via Getty Images)