It wasn't clear if heart damage in COVID-19 patients results from inflammation or the virus itself. New research with engineered tissue suggests the latter.

The Johnson & Johnson vaccine joins ones from Pfizer and Moderna in the fight against COVID-19. Here's what ypu need to know about it.

The Johnson&Johnson vaccine joins ones from Pfizer and Moderna in the fight against COVID-19. Here's what ypu need to know about it.

COVID-19 vaccines appear less effective against three new SARS-CoV-2 variants, researchers report. What does that mean for fighting the pandemic?

COVID-19 vaccines appear less effective against three new SARS-CoV-2 variants, researchers report. What does that mean for fighting the pandemic?

Giving vaccine priority to older adults and others most at risk of dying will actually save the maximum number of lives and the most years of life.

"This proportion is quite surprising. It's crucial that everyone—including individuals who don't show symptoms—adhere to public health guidelines..."

A new diagnostic tool that plugs into a phone can test for COVID-19 in 55 minutes or less, researchers report. It can be done almost anywhere, too.

In several countries, including the US, the number of people who say they'll get a COVID-19 vaccine is falling short of the number needed for herd immunity.

An expert breaks down what we know about the new coronavirus strains and why you should be wearing two masks during the pandemic.