A new COVID strain has become increasingly more common in the U.S. in recent weeks and can cause a painful symptom that some are calling "razor blade throat." COVID variant, NB.1.8.1, nicknamed Nimbus,

A new COVID-19 variant spreading in some parts of the world has been nicknamed "razor blade throat" because of its painful symptoms. The variant — NB.1.8.1. or "Nimbus" — has been identified by doctors in the United Kingdom, India and elsewhere, The Associated Press reports.

A new COVID-19 variant spreading across the United States may cause an extremely painful sore throat—dubbed the "razor throat"—among its symptoms. The new "Nimbus" strain, also known as COVID-19 NB 1.