Cases across the country had appeared to decline before new public health data showed upticks in infections.

How long are you contagious with the flu? Experts say you can spread the virus for five to seven days after symptoms start, sometimes longer for children and adults.

At least 52 children have died from the flu in the US this season, with over 90 per cent unvaccinated, according to the CDC.

Flu activity has ticked back up slightly in the US, thanks to a very small increase in infections caused by influenza B — ...

Fifty-two children have died of the flu so far this season, the Centers for Disease Control and Prevention reported Friday, seemingly putting pediatric deaths on track to outpace last season's ...

Flu activity increased nationwide after three weeks of decline, driven in part by rising influenza B activity, according to the CDC’s latest Fluview report. Although flu-related hospital admissions ...

State agriculture officials announced this week that the highly pathogenic H5 avian influenza, known as bird flu, was ...

Learn how Subclade K, a variant of the influenza A virus, is affecting immune responses and contributing to this year’s intense flu season.

Wondering why this year's flu season is so bad? Doctors are urging precaution with the flu vaccine less effective this season ...

CHICAGO — Flu cases are increasing rapidly in Illinois as the state sees its worst flu season in more than 15 years.