AUDIO: Indiana Department of Health Talks Influenza Variant "Subclade K"12/18/2025With cases of the flu on the rise, an influenza variant called “subclade K” has been spreading across Europe and Asia, and has made its way to the U.S. Nicole Stone is the Epidemiology Director for the Indiana Department of Health’s Infectious Disease Epidemiology and Prevention Division, and she says subclade K is a variant of the seasonal influenza A strain H3N2… Stone says early information is indicating the flu vaccine is still effective at minimizing hospitalization for the flu. To protect yourself from the flu, click here for more tips from the CDC. Click here to visit the Indiana Department of Health's Influenza Dashboard.