A new COVID-19 variant is spreading rapidly through the U.S. What to know about NB.1.8.1 and its symptoms in Tennessee.

A new COVID-19 variant, NB.1.8.1 - nicknamed "Nimbus" - is rapidly emerging as one of the most common strains in the U.S.

As a new variant that causes 'razor blade throat' spreads, the FDA updates vaccine warnings to include information on heart ...