The winter flu season features two types of influenza. Here's what you need to know about them and how they differ.

H5N9 is “not commonly seen in poultry in general,” says Eman Anis, assistant professor at the University of Pennsylvania ...

For a second time this season, at least 41 states are reporting high or very high levels of the flu. Here's how to stay safe.

(NEXSTAR) – The flu is spreading far and wide across the U.S. – and influenza A is largely to blame. Of all the flu tests reported to the Centers for Disease Control and Prevention since the ...