While we often refer to it as "the flu," the influenza virus has several strains, with flu A and flu B considered the most common and the most severe.

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.

Schools around the country are closing due to surges of flu and other illnesses which are sickening students and staff. Here's what parents need to know.

Flu A and flu B are two different strains of influenza, explains Thomas Russo, M.D., professor and chief of infectious ...

With the devastating 1918 pandemic in mind, US health officials saw an outbreak in Asia and swung into action. What happened ...

Nearly 119,000 birds have been culled at a farm in California after a bird flu called H5N9 was detected among the poultry ...

Like clockwork, flu viruses seem to strike more people in winter than in any other season—and there are several reasons for ...

Bird flu has decimated poultry flocks and infected cattle herds. The risk to humans is currently low, but that could easily ...

It feels like everyone is sick right now. And while that is a slight exaggeration, the real situation isn’t too sunny either.

RSV, respiratory syncytial virus, usually peaks in December and January while infecting the nose, throat and lungs, usually ...