A new COVID test uses gargling with saltwater instead of a stick up your nose. Researchers say initial results are promising.

Using a method originally developed to detect mad cow disease, researchers discovered that a simple skin test can accurately identify Parkinson's disease.

Even though wait times for COVID test results have dropped in the United States, they still don't come back fast enough to be useful for contact tracing.

Swallowing a tiny capsule could offer a full view of your GI tract and gut bacteria. The tiny tool could even scoop up bacteria and deliver them to doctors.

There's no pandemic "silver bullet", but COVID-19 testing, contact tracing, masks, and vaccine development are key to going back to school or the office.

Detecting a specific kind of protein in a blood test could help diagnose Alzheimer's disease far before symptoms begin to appear, reasearchers say.

An eye scanner can detect biological aging, rather than your chronological age. It decodes the "record of how a person is aging at the molecular level."

COVID-19 tests that have patients swab their own noses are as accurate as the more invasive tests that health care workers administer, a small study finds.

Experts call for large-scale viral testing in children, contract tracing, and other actions to avoid compounding the COVID-19 crisis as schools reopen.

When interpreting COVID-19 antibody tests, caution is key. Here, experts explain the best way to use the tests and why false positives are so concerning.