Overview
- The NB.1.8.1 variant, nicknamed Nimbus, was responsible for an estimated 37 percent of U.S. COVID-19 cases in the two weeks ending June 7.
- The WHO designated NB.1.8.1 a variant under monitoring on May 23 after it was detected in at least 22 countries and 14 U.S. states.
- Federal guidelines announced by HHS Secretary Robert F. Kennedy Jr. will restrict updated COVID-19 booster eligibility to those 65 and older or people with underlying health conditions.
- Patients report symptoms similar to other Omicron subvariants but with some experiencing an intensely painful "razor blade" sore throat.
- The CDC has ramped up genomic sequencing and wastewater surveillance to track the more transmissible strain as hospitalizations and deaths remain steady and low.