A new Covid variant is spreading across the U.S. and it may be able to evade protection from current vaccines.

NEW YORK -- Should you take your COVID tests by swabbing your throat instead of your nostril? ABC's Chief Medical Correspondent Dr. Jen Ashton says it really depends on the test. Dr. Ashton joined ...

Add Yahoo as a preferred source to see more of our stories on Google. If you're feeling sick, it can be frustrating to see a negative COVID test result. Some people say they only get an accurate COVID ...

Severity of a COVID-19 illness could be determined by examining autoantibodies in the nasal cavity, allowing more personalized treatment protocols. Severe COVID-19 can be life-threatening for patients ...

Adding a throat swab specimen to a nasal specimen significantly increased sensitivity of COVID-19 rapid antigen tests, whether self-collected or collected by a healthcare worker, a randomized clinical ...

Anyone who has had a COVID-19 PCR test done knows the drill — a swab up the nose and then the tester pops the swab into a plastic bag and off it goes. That’s when the hard work begins of determining ...

A 14-month program in Canadian long-term care facilities has found that floor swabs accurately detect a COVID-19 outbreak days before it is identified by staff members. Floor surfaces were sampled ...