Painful sore throats have been a common symptom of previous COVID strains, but Nimbus is gaining attention for what some describe as excruciating pain. Patients have likened the sensation to swallowing razor blades or shards of glass. Other symptoms include fatigue, cough, fever, muscle aches and congestion.

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,

The newest variant, NB.1.8.1, also known as Nimbus, is now widespread in California and across the United States. The new variant comes with increased transmissibility, and some are reporting an unpleasant symptom: “ razor blade throat ,” or a severe sore throat.