Flu season in the U.S. is particularly bad this year, and a new branch of the flu family tree may be to blame.

Health experts say the U.S. flu season appears to be waning with two straight weeks of decline in measures of flu activity.

Amid a severe flu season, the CDC ends its universal flu shot recommendation for kids. Experts explain why this is dangerous ...

A particularly infectious subvariant of influenza is keeping emergency room numbers high and causing especially severe ...

Flu cases and hospitalizations are surging, already breaking last season's records. Here's where activity is highest, what ...

Flu cases are ticking down, but experts warn the U.S. isn’t out of the woods yet.

All viral activity benchmarks have gone down, except for a slight increase in the death rate. Here's what to know about the state of the flu season.

New York state is seeing the highest number of flu cases ever recorded in a single week, according to the state Department of Health. Health officials reported 71,123 positive flu cases during the ...

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