Questions about COVID-19 test accuracy raised across the testing spectrum

For Sarah Bowen, it all started with a sore throat. Not the kind of searing pain she’d feel with strep, she said, but a throat irritation that just didn’t feel right.

“By the end of the day, it just got a little worse and I didn’t feel great. I felt like I might be coming down with something. And the next day, things got worse,” Bowen, 31, of Portland, Oregon, said.

Bowen works at a doctor’s office, where she was immediately able to get tested for COVID-19, on May 8....