Federal data shows COVID-19 is trending up in most states, with emergency department visits up among people of all ages.

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

It's not what we might expect but it is possible to get the sniffles, or worse, in the summer. New data from the U.S. shows ...

The “Stratus” variant (XFG) was first identified in January in Southeast Asia. By June, it accounted for 14% of COVID cases in the U.S. While the symptoms of XFG are generally consistent with other ...