Covid-19 was never just another cold. We knew it was going to stick around and keep changing to try to get the upper hand on our immune systems. But we've changed, too. Our B cells and T cells, ...

It's not just President Biden who recently tested positive for COVID — cases of the virus are spiking across the country. Why the seemingly sudden summer surge? There are a couple of factors at play, ...

As evidence mounts that the omicron variant is less deadly than prior COVID-19 strains, one oft-cited explanation is that viruses always evolve to become less virulent over time. The problem, experts ...

Scientists from Japan and Thailand have identified a new group of coronaviruses closely related to SARS-CoV-2 in horseshoe ...

Dr. Omer Awan details lessons from COVID-19 that should be driving the U.S. response in order to contain the Andes hantavirus ...

Another recent study out of Australia, of nearly 23,000 people with confirmed Covid-19 infections between July and August 2022, found that 18% of the more than 11,000 who responded met the case ...

Now that Covid-19 infections have started to rise again, it feels like people all over the country are testing positive, and it's hard to know how to react. The government has been dialing back its ...