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 ...

The N.B.1.8.1 variant was first detected in January 2025. By the end of April, it was the dominant strain in both Hong Kong ...