You may get a PCR test, which can show a positive result for up to three months after recovery. If you take a rapid antigen test, it may not detect COVID after nine days, but it is more accurate for ...

Stay on top of what’s happening in the Bay Area with essential Bay Area news stories, sent to your inbox every weekday. See Senior Director of TV Programming Meredith Speight’s recommendations from ...

Antibodies against the novel coronavirus declined rapidly in the British population during the summer, a study found on Tuesday, suggesting protection after infection may not be long lasting and ...

Results are detected within just a few minutes, the agency said. The Food and Drug Administration has granted emergency use authorization for a COVID-19 test that uses breath samples -- the first of ...

The FDA has issued emergency authorizations to 12 antibody tests for the virus. As federal officials gradually begin reopening the country, expanded testing is central to the conversation. Until now, ...

The NHS has issued a five-day Covid rule to help prevent the virus from spreading as cases continue to rise. The latest data ...

They were tested for COVID-19 with rapid antigen tests (RATs) twice weekly. Positive results were confirmed with PCR. If a participant had symptoms but a negative RAT, they were tested for a wide ...