COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late-June, it became the third-most common strain.

COVID-19 variant XFG accounted for 0% of U.S. cases in May. By late June it became the third-most common strain as COVID ...

COVID-19 is surging again, indicated by rising wastewater levels and infections across many states. A new variant, Stratus ...

COVID-19 cases are rising again in the United States, and the "stratus" variant might be to blame. The big picture: A summer ...

A new COVID variant, "Stratus", has grown in the U.S. and has now climbed the ranks, but little is known about its impact in ...