There is broad consensus that widespread SARS-CoV-2 testing is essential to safely reopening the United States. A big concern has been test availability, but test accuracy may prove a larger long-term ...

So you have a cough and fever, and you just got test results back for the novel coronavirus: Negative! But wait a second. Your doctor may still caution you to act like you could have it. Stay home.

A negative test is helpful, scientists and doctors say. But it doesn’t mean you should skip other measures, like quarantining, masking and distancing. By Claire Cain Miller Katherine J. Wu and Margot ...