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

COVID-19 activity is rising in much of the country. Data shows overall respiratory virus spread is very low in the U.S.

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

According to the Centers for Disease Control and Prevention, the strain is now the third most common COVID-19 variant in the ...

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