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.

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

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

A new, highly infectious COVID-19 strain that has been running rampant in China has now been detected in the US, including cases in New York City, according to the Centers for Disease Control and ...

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

A new variant of COVID-19 known as NB.1.8.1, or “Nimbus,” was first observed last January and has since been identified as ...

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

A contagious new COVID-19 variant called NB.1.8.1, aka "Nimbus," is now dominant in the United States, CDC data show. What to know about symptoms and vaccines.

All hypotheses on how the Covid-19 pandemic began remain open, the World Health Organization said yesterday, following an ...

WHO’s Tedros says ‘all hypotheses must remain on the table’ after critical information not provided to investigators.

The WHO Scientific Advisory Group reported progress in understanding COVID-19's origins but noted that critical information ...