'Razor blade throat' among new COVID variant symptoms: Has it reached Massachusetts Scientific name of the new virus is NB.1.8.1. but it's being called 'Nimbus.'

A new COVID-19 variant, designated as NB.1.8.1, or "Nimbus," is spreading rapidly in the U.S. and is associated with a painful sore throat, commonly referred to as "razor blade throat."

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