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

They are bracing for a brutal season, driven by a new and alarming variant that is expected to circulate widely.

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

The death toll and economic damage associated with flu highlight its role as one of the most harmful viruses in history.

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

A novel influenza variant called subclade K appears to be driving an uptick in cases and hospitalizations throughout the U.S.

Flu and RSV infections are rising nationally just one week before Christmas, according to the Centers for Disease Control and ...

Researchers are striving to understand the impact a phenomenon known as original antigenic sin has on immunity to the virus.

Scientists have captured an unprecedented, real-time view of influenza viruses as they move across and slip inside human ...

Mexico has confirmed its first case of influenza A(H3N2) subclade K, a variant commonly referred to as the "super flu," ...

A surge of influenza among school-aged kids is linked to the recent deaths of multiple Ontario children, prompting calls for ...

Scientists have warned H5N1 bird flu could make a dangerous leap to humans, triggering a global health crisis.