A new COVID-19 variant is climbing the ranks in the United States, becoming the third-most common strain of the summer. Variant XFG, colloquially known as "Stratus," was first detected in Southeast ...

The variant is officially named XFG but is being called Stratus. It was first found in Southeast Asia in January, and at the time was 0% of cases in the U.S., but by the end of June, it was about 14% ...

The new variant is called NB.1.8.1. It arrives as the United States’ official stance on COVID-19 vaccination is changing. NBC Universal, Inc. COVID-19 cases are rising again as a new variant begins to ...

COVID-19 variant XFG is spreading across the U.S., becoming the third most common strain. XFG is a combination of variants F.7 and LP.8.1.2 and may be less contagious than other dominant variants.