Known as subclade K, a new, mutated flu strain that has dominated in Europe and Asia is now rapidly spreading across the US.

The latest data on respiratory illness in the United States shows that shoppers and merry-makers are spreading more than just holiday cheer: They’re also passing around germs. In many cases, it’s a ...

It's *** gift no one wants to give or get, but with travel and get-togethers this holiday season, respiratory viruses can be ...

Tis the season for sniffling, coughing and calling out of work. Here's what to know about the pathogens circulating in the ...

Health officials are warning people about a flu virus called H3N2 that is spreading in the United States and other countries ...

Health officials have warned this season’s flu is being driven largely by the newly identified H3N2 subclade K strain.

Following a national trend, 52 counties in Florida saw increasing cases of influenza A driven by a new mutation called ...

A new influenza strain could fuel a severe flu season while a surge in measles cases threatens U.S. elimination status, ...

The CDC also noted two new flu-related deaths in children and provided data on the rise of subclade K among H3N2 flu viruses as Americans approach the peak season of gathering with family and friends.

Seasonal flu activity is up across the United States, according to data from the Centers for Disease Control and ...

The United States Department of Agriculture on Friday confirmed that a case of highly pathogenic avian influenza in a ...