A variant strain of the coronavirus, one that was first discovered in the United Kingdom, is now the dominant strain of the virus circulating throughout the United States, CDC Director Rochelle ...

Add Yahoo as a preferred source to see more of our stories on Google. Getty Images An alleged warning has spread online for years about a supposed "new COVID-Omicron XBB variant" — a new strain of the ...

A new mutated strain of the common flu, influenza H3N2, subclade K, is spreading across the Northern Hemisphere, including the United States. This particular strain has gained dominance in many ...

The United States is seeking a massive surge in flu cases this winter, many of them attributed to the so-called "super flu." Why it matters: An unprecedented rise in flu cases comes as other ...

ATLANTA - EXCLUSIVE: The Centers for Disease Control and Prevention on Tuesday will announce that the delta strain of COVID-19 is a "variant of concern" in the U.S., but that two doses of the Pfizer ...