U.S. public health authorities have skirted normal procedures and announced two major policy changes that will likely reduce ...

A new, more transmissible variant of the virus, known as NB.1.8.1 or Nimbus, has been circulating through Asia and other ...

NB.1.8.1 - also known as the Nimbus variant - has been responsible for a surge in cases in Asia, and is now in the UK ...