Imagine a virus so lethal that up to 90% of those infected don’t survive. That’s Marburg - a rare but extremely dangerous disease with no known cure. In this video, we explore its history, how it ...

The virus that commonly causes cold sores starts reshaping our genome within an hour of infection to boost its own growth, which scientists could take advantage of to treat severe cases.

A new Covid-19 variant called NB.1.8.1, or Nimbus, represents about a third of new US Covid-19 cases. Dr. Leana Wen answers common questions about the new variant.

The sample was taken on June 13. So far, there are no cases in humans. While this is early to detect West Nile virus, experts cautioned that this does not necessarily foretell a bad mosquito season.