Explain It to Me Why everyone is sick right now
11 snips
Jan 11, 2026 
In this enlightening discussion, Caitlin Jettelina, an epidemiologist, breaks down the intense flu season and the unexpected shift in H3N2. Science writer Carl Zimmer dives into the mechanics of viruses and how they evolve, while Yale's Ellen Foxman reveals why some people remain asymptomatic. Together, they tackle immunity, debunk common health hacks, and explore the protective power of mild infections. Tune in for expert insights on staying resilient amid the viral chaos!
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Mutated H3N2 Is Driving This Season
- A drifted H3N2 flu subclade (K) evolved over the southern hemisphere winter and is now evading prior immunity.
- That partial immune escape explains higher cases and potentially more severe illness this season.
Get The Flu Shot Anyway
- Get the flu vaccine even during a bad season because it reduces hospitalization and death.
- Vaccination may not prevent infection but still substantially lowers severe outcomes.
It's Not Too Late To Vaccinate
- It's not too late to vaccinate; flu shots take about two weeks to become effective and the season hasn't peaked.
- Vaccines also cover multiple strains, lowering risk of subsequent infections later in the season.
