As cases of flu have reached their highest level in 25 years in the U.S., doctors are warning Americans that symptoms of this ...

A variant of influenza A, H3N2, is spreading across the U.S., with low vaccination rates contributing to infection rates.

Those infected with the flu are most contagious during the first three days, the CDC said. In some cases, however, people can ...

Colorado is experiencing a continued spike in flu cases this winter as the "super flu" races through the state. Why it ...

The UK is experiencing a more aggressive flu season, with the H3N2 strain potentially causing more severe symptoms, including ...

This year’s influenza virus has been dubbed the “super flu” for how quickly it’s spreading — and how hard it’s hitting.

Norovirus is the country's leading cause of vomiting, diarrhea, and foodborne illness, and right on schedule, it's picking up ...

It’s too early to have data on how long most people are sick with subclade K, but Dr. Schaffner says he’s heard anecdotes of ...

Although the current flu vaccine offers protection against the H3N2 strain, it doesn’t cover subclade K, which hadn’t been ...

With flu cases surging in Illinois, mitigating spread is increasingly important. But how long are you actually contagious ...

Massachusetts health officials are encouraging everyone to get a flu shot amid a surge in illnesses already linked to the ...