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

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.

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

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

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

The origins of SARS-CoV-2 remain unsolved, concludes the full report from the World Health Organization’s Scientific Advisory Group for the Origins of Novel Pathogens (SAGO).1 Despite more than three ...

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 ...