There is a lot of information about coronavirus vaccines out there, and some of it seems vague or contradictory. We talked to experts to help answer some of the most common and confusing questions.

Thanks to at-home testing, official reports are missing a lot of the COVID cases circulating now. Is the U.S. in the midst of an invisible surge? Here's how to assess the situation where you live.

Recent research and anecdotes suggest people are testing negative on rapid tests even after they have symptoms, then later testing positive. Here's what researchers think is going on.

We answer key questions about COVID tests: What types are there? Should you self-test right after exposure to someone with COVID? And what should you do if you test positive?

A businessman from Dallas got a PCR test for the coronavirus at a suburban emergency room. The charge for his test was "egregious" but not illegal, say health care analysts. Here's what happened.

Six states will purchase 3 million rapid tests, and more states may join the consortium. Maryland, Virginia, Louisiana, Michigan, Ohio and Massachusetts want to stem a severe testing shortage.