The laws governing Medicare don't provide coverage for self-administered diagnostic tests, including rapid antigen tests. Here's how older adults can get free tests anyway.

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.

With a fast-growing winter surge upon us, self-testing kits remain expensive and hard to find. The reasons go back to the approach the U.S. took from the outset in developing tests.

The investment is a response to an ongoing national shortage and follows a $2 billion investment in September to supply rapid tests to community health centers, food banks and schools.

Musk was using the less-accurate rapid antigen tests. He said something "bogus" was happening and is waiting results from a test that is considered more reliable but takes longer to process.

Some colleges are betting on new, proprietary tests they've developed to keep the college safe. The idea is, test everyone at least twice a week and you can catch most infections early.

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.