Advisory Board January 6, 2026
Over the holidays, flu cases and hospitalizations surged across the United States, largely driven by a new “super flu” variant that has also been spreading in other parts of the world.
What is the ‘super flu’ variant?
Last summer, a new mutated strain of influenza A (H3N2) called subclade K emerged in Australia. Later in the fall, health officials in the United Kingdom and Canada reported that subclade K was driving an increase in flu hospitalizations in their countries.
According to an early analysis from the U.K. Health Security Agency, subclade K has seven gene changes on an important segment of the flu virus. The mutations change the shape of the region, which makes it harder for the body’s...
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