The XFG strain, nicknamed “Stratus,” is the predominant variant currently circulating. It has been on the rise since May in ...

CDC wastewater also shows the XFG variant — nicknamed stratus — is most common in the U.S. Stratus can cause a “razor blade” ...

A new strain of COVID-19 known as Stratus that is spreading worldwide has been detected in Arizona.

Variant XFG, colloquially known as "Stratus," was first detected in Southeast Asia in January but accounted for less than ...