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.

Mutant H3N2 flu is hitting the UK hard, with the strain having mutated seven times over the summer. Now experts have warned ...

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

A dangerous flu strain is sweeping the UK with health officials warning it could kill thousands in the "worst flu season in ...

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 ...

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

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

The numbers are especially grim in the Big Apple: According to preliminary hospital data collected by New York City’s ...

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 ...