How A Mutation Made This Year’s Flu Season So Bad

from Science Friday · host Flora Lichtman, Kathleen Davis

A rogue strain of flu, subclade K, has sickened more than 19 million people in the US so far this season. And the flu shot hasn’t offered that much protection. What’s going on with this superflustorm?Joining Host Flora Lichtman with some answers is Jennifer Duchon, a pediatric infectious disease specialist.Guest: Dr. Jennifer Duchon is a pediatric infectious disease specialist at Mount Sinai Hospital in New York.Transcripts for each episode are available within 1-3 days at sciencefriday.com. Subscribe to this podcast. Follow our show on Instagram, TikTok, Facebook, and Bluesky @scifri and sign up for our newsletters. Got a science question that’s keeping you up at night? Call us: 877-472-4374 Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.

What this episode covers

A flu variant called subclade K emerged too late to be fully covered by this year's vaccine. But the flu shot can still help protect you.

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How A Mutation Made This Year’s Flu Season So Bad

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This episode was published on January 26, 2026.

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