After exposure to COVID-19, most infections become detectable within 3–7 days. Testing too early can yield false negatives, ...

A phase 2 study shows that azelastine nasal spray lowered coronavirus infection rates to 2.2% compared to 6.7%, researchers ...

Knowing what viral infection you have can mean getting the right antiviral medication and taking the right precautions, ...

What is antibody testing and where to get a COVID-19 test Antibody testing can determine if a person’s blood shows signs of COVID-19 exposure.

There are three different ways to test for COVID-19: PCR tests, antigen tests and antibody tests. Here are the differences.

Some experts have noticed that it's taking some people with COVID-19 much longer to get a positive result on an at-home antigen test. So, if you have symptoms but have tested negative, what should ...

Have you recently taken a COVID-19 test? If you're waiting for your COVID-19 test results, Mayo Clinic COVID-19 diagnostic experts have some helpful guidelines to walk you through the process.

You swabbed the inside of your nose and performed the at-home rapid antigen test for COVID-19 and thankfully, it was negative.

Experts discuss what it might mean if you get a faint line on a home COVID-19 test, when to take another test and what precautions to take.

To determine whether your COVID test is still usable, you can check the at-home COVID-19 tests listed on the FDA's website to see which brands have had their shelf lives extended.

Health officials stress that at-home tests are a vital and accurate way of tracking COVID-19 infections but an initial negative test doesn't mean people are out of the woods.