To slow its spread, everyone in the US should be tested for COVID-19 on a regular, rotating basis, epidemiologists say.

A bioluminescent capsule tests levels of bile salt hydrolase in the gut and its creators say its findings suggest the power of probiotics.

A new microneedle patch is low cost and easy to use. But another feature may offer it's biggest advantage for some: It's almost completely pain-free.

Saliva tests for COVID-19 are just as effective as nasal swabs and cost less, a pair of studies shows.

A new lab-on-a-chip device called real-time ELISA combines blood tests to provide something more like a movie than a photo.

A 15-minute COVID-19 test that uses a smartphone device could one day address the need to expand testing capacity in outpatient clinics.

There's growing evidence that Bartonella infection can involve skin lesions and mental symptoms, report researchers.

"Interstitial fluid originates in the blood and then leaks out of capillaries to bring nutrients to cells in the body's tissues." New microneedles can sample it for testing.

Using "lab on a chip" technology, researchers have created a microlab half the size of a credit card that can detect COVID-19 in just 30 minutes.

"Analyzing microRNA profiles in saliva... is a non-invasive way to test for concussion that can't be influenced by a patient's feelings or motives."