For any American wondering if they have Covid-19, there are two kinds of tests available: polymerase chain reaction (PCR) and rapid antigen (sometimes just called “rapid tests”). The two tests work in ...

Polymerase chain reaction (PCR) and rapid (antigen) tests for COVID-19 both involve taking a swab. Results for a PCR test take longer, as it needs to go to a laboratory. It is more costly but tends to ...

What does it mean if a person's rapid antigen test result comes back positive after five days of isolation due to COVID-19? According to the experts, that person is most likely still carrying a viral ...

Editor's note, March 7, 2023: The recommendations in this article are out of date and will not be updated going forward. Should you feel sick, we recommend talking to a health care professional.

COVID-19 rapid tests are easy to take—and then toss. So most people never report their results, which leaves health officials with an incomplete picture of how much virus is circulating and where. The ...

The Food and Drug Administration on Wednesday authorized the first rapid coronavirus test that doesn't need any special computer equipment to get results. The 15-minute test from Abbott Laboratories ...

Giorgia Guglielmi is a science journalist in Basel, Switzerland. As the number of UK coronavirus cases surged in early 2021, the government announced a potential game-changer in the fight against ...