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

(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 start of ...

Influenza, commonly known as the flu, is a contagious respiratory illness caused by the influenza virus. According to the Centers for Disease Control and Prevention (CDC), there are four types of flu ...

Learn the key symptom differences between flu strains, which is more dangerous, and how the vaccine protects you from both Flu A and B, per experts.