New COVID Variant NB.1.8.1 'Nimbus' Now Driving 37% of Cases in US: Know These Symptoms

As summer begins, a highly contagious new COVID-19 variant called NB.1.8.1, or "Nimbus," is spreading rapidly in the United States. The mutated omicron strain, which caused surges in China and other parts of Asia earlier this year, is now driving more than one-third of cases across the country, new data show. Nimbus was first detected in the U.S. in late March through international airport screening programs. Since then, the fast-spreading and highly infectious variant has been detected in more than a dozen U.S. states, and cases are expected to keep...