The World Health Organization on Saturday reported 3,440 confirmed cases of swine flu in 29 countries, with 48 deaths from the sickness. The virus, also called H1N1, has spread as Australia reported its first confirmed case.

A highly contagious flu mutation called subclade K is sweeping the nation, raising health concerns about vaccine effectiveness this season. Here are the states at most risk.

PHILADELPHIA (WPVI) -- It continues to be a fairly mild year nationally for influenza, and the vaccine is better than in recent years. But locally, the picture' is a little different. The CDC says the vaccine is 47-percent effective, compared to just 40 ...

Poyer, also the mother of two young children, thinks about swine flu, also known as influenza A H1N1, every day, both at school and at home. She knows that some schools nationwide

Everyone seems to have the flu this year. And they’ve got it bad. The numbers are especially grim in the Big Apple: According to preliminary hospital data collected by New York City’s syndromic surveillance system,