SAN FRANCISCO -- A case of the coronavirus variant was detected in Southern California Wednesday, while a second suspected case has been identified in Colorado. According to officials, the COVID-19 ...

There’s a new Covid variant in town. The strain, known as XEC, is gaining a foothold in the United States, accounting for an estimated 5.7% of new cases in the past two weeks, the Centers for Disease ...

Over the nearly five years since COVID first emerged, you’d be forgiven if you’ve lost track of the number of new variants we’ve seen. Some have had a bigger impact than others, but virologists have ...