Cases of the COVID-19 variant Omicron BA.2.86, also known as Pirola, have tripled in two weeks, comprising between 5% and 15% of all infections, according to the Centers for Disease Control and ...

A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine effectiveness this season. Here are the states at most risk.

New coronavirus variants dubbed “FLiRT” are circulating the world and growing dominant in the U.S., and although cases and deaths are on a decline, some experts worry these variants may cause a summer ...

COVID-19 variant XFG is spreading across the U.S., becoming the third most common strain. XFG is a combination of variants F.7 and LP.8.1.2 and may be less contagious than other dominant variants.

As the summer travel season picks up, COVID cases and hospitalizations are rising in Los Angeles County — and some of those recently reinfected are finding their latest bout to be the worst yet. There ...

A new Covid variant has become dominant in the U.S., but relatively few people have thus far gotten the new shots that could offer some protection against it. The variant, called HV.1, replaced EG.5 ...