A newer COVID-19 variant may be causing a severe sore throat in those who contract the infections. Here's what to know about "razor blade throat."

So far, 15 U.S. states have positive Nimbus cases, including Rhode Island, New York, Vermont, and Massachusetts.

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 blade throat” COVID. That's because the variant — NB.1.8.1. or “Nimbus” — may cause painful sore throats.