A new influenza strain this flu season is raising concerns as Americans hit the roads and take to the skies ahead of the Thanksgiving holiday, with fewer people choosing to get vaccinated.

What is the new flu strain subclade K?

The new flu strain, called subclade K , is a variant of the H3N2 virus that has been circulating since the summer in other countries.

Experts point to the new variant as a main driver of a spike in flu cases in Canada, Japan, and the U.K. Of nearly 150 test samples that were registered as the H3 lineage, over 50% were subclade K, according to the Centers for Disease Control and Prevention .

Does the flu vaccine protect against subclade K?

Although the current flu vaccine may not be a perfect match for the new subclade K strain, the CDC and doc

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