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 ...

The highly contagious Nimbus is now Britain's most dominant strain with official UKHSA data suggesting infections have ...

British scientists had warned Nimbus could lead to a surge in Covid cases as many people's immunity had likely faded ...

The COVID-19 variant that may be driving a recent rise in cases in some parts of the world has earned a new nickname: “razor ...