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Forty-seven states now have widespread outbreaks of the influenza virus, according to the Centers for Disease Control and Prevention. We look at the Philadelphia area, where health officials say flu season arrived early this year.

If patients can refuse a flu shot, why not health care workers? Hospitals are increasingly cracking down on employees who refuse to get flu shots across…

It's hard, during flu season, to avoid inhaling a virus or two (or three, or 10,000), but that doesn't mean they're going to take you over. You have an army of defenders in you, ready to take them on.

The flu season may be easing up in some parts of the country, but it's far too soon to let you guard down. The Centers for Disease Control and Prevention says influenza infections ebb and flow unpredictably.

Across the nation, many Americans are suffering from an outbreak that has hit hard and hit early. Hospitals are jammed and many places are running out of vaccine. The flu's already been blamed for the deaths of at least 20 children.

Warnings that this year's flu season was likely to be a bad one are already bearing out in Boston. But an infectious disease doctor says the flu season may have already peaked last week.

Vaccination is still the best way to avoid getting sick, but it's not 100 percent protective. Some people may get infected with a strain of flu that isn't covered by this year's vaccine. For others, the shots just don't work.

When scientists figured out how to make the deadly H5N1 virus more contagious, a debate ignited about whether to publish the research and do more experiments. Over the past year, scientists published the contentious work, but they still can't agree on the field's future.

Across Colorado, hospitals are demanding all employees get flu shots or be fired.The choice pits the safety of sick patients who could die from a…

Scientists recently sparked controversy when they made dangerous new forms of bird flu. The National Institutes of Health is about to put in place a new system for reviewing this kind of work in the future.