A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine ...

Last year’s flu season was the roughest in nearly a decade. “We generally don’t have two bad flu seasons back to back,” said ...

The variant has mutations that may allow it to evade some vaccine protections, though the current flu vaccine still offers some defense.

Flu season intensifies as the new H3N2 variant causes severe illness worldwide. Experts urge vaccination, hand-washing and ...

The XFG variant of the severe acute respiratory syndrome coronavirus 2 as continued to spread as the U.S. heads into peak Summer travel season. (Photo by I RYU/VCG via Getty Images) There’s another ...

A new COVID-19 variant called NB.1.8.1 was first collected in China in January. As of May 27, less than 20 cases of the new variant had been reported in the U.S. Currently approved COVID-19 vaccines ...

A new investigation published in JAMA examines how COVID-19 vaccination affects maternal and perinatal outcomes among ...

The new Covid variant is continuing to proliferate around the U.S. — although you might not know it by just checking federal variant-tracking dashboards. Known as NB.1.8.1, the omicron variant has ...

A new COVID variant known as NB.1.8.1 has made landfall in the United States. The variant, which was first detected in China this past January, currently accounts for 10% of the SARS-CoV-2 sequences ...