Subclade K (previously known as J.2.4.1) is gaining attention because it appears to be spreading much earlier in the flu ...

The Influenza A H3N2 virus subclade K represents a change in the basic structure of the influenza virus.

A surprising flu experiment shows that good airflow and fewer coughs can stop the virus from spreading, even up close.

Covid-19 infections have been strongly linked with cardiovascular conditions like heart disease and stroke, but new research shows that other viral infections such as influenza, HIV, hepatitis C and ...

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

In a striking real-world experiment, flu patients spent days indoors with healthy volunteers, but the virus never spread.