Some viruses mutate more rapidly than others. Learn more about why that is and what that means for your health.

UK experts warn a rapidly mutated H3N2 subclade is driving rising hospitalisations across England, prompting calls for ...

A newly mutated H3N2 subclade K flu strain with seven mutations is spreading fast worldwide, causing rising cases and ...

A 13-year-old girl in British Columbia who was hospitalized with bird flu for several weeks late last year harbored a mutated version of the virus, according to a report published this week in the New ...

So far, just 36 percent of U.S. children have been vaccinated—down 23 percent from a half-decade earlier, likely due to ...

The BriefA new H3N2 flu strain, known as subclade K, is circulating internationally and raising concern among health ...

A mutated flu virus is spreading across the U.S., with 86.8% of recent cases identified as H3N2 subclade K. The flu shot is ...

The state has higher rates of flu hospitalizations, emergency room visits and positive tests than it did at this time last ...

With no peak in sight, NHS England says there are now enough flu patients to fill more than three whole hospital trusts.