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.

An expert group from the World Health Organization failed to find a definitive answer to the COVID-19 pandemic’s origins in ...

New WHO report suggests COVID-19 originated from animal-to-human transmission, though Director-General Tedros maintains all ...

New viruses that are genetically similar to known fatal viruses have been discovered near food sources in a concerning new ...

The findings concern two viruses closely related to Nipah and Hendra, which can cause brain inflammation and respiratory ...

Twenty new viruses have been discovered within bats in China, "raising urgent concerns" that these diseases might spill over ...

Scientists in China have discovered a host of never-before-seen viruses in bats that live near humans. These viruses include ...

Medical experts have sounded the alarm after 20 new bat viruses were identified in China, urging Australians to remain ...

"Until further requests for information are met, or more scientific data becomes available, the origins of SARS-CoV-2 and how ...

Scientists have discovered 20 new viruses in bats in Yunnan, China. In a world still recovering from COVID-19, findings like ...

The World Health Organization’s expert group says the origin of COVID-19 remains inconclusive, though most evidence still ...