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2025-26 U.S. Influenza Vaccine Effectiveness

The effectiveness of the influenza vaccine in the U.S. for the 2025-26 season, including how estimates are generated and published by the CDC.

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Jan 18, 2026
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When will CDC publish a U.S. vaccine effectiveness estimate for the 2025–26 season and how are those studies designed?

Public reporting from CDC and partner networks indicates there is no single fixed calendar date for a U.S. influenza vaccine effectiveness (VE) estimate for the 2025–26 season; instead CDC and its sur...

Jan 7, 2026

When will the CDC publish U.S.-specific vaccine effectiveness estimates for the 2025–26 season?

The Centers for Disease Control and Prevention (CDC) does not publish a fixed calendar date for U.S.-specific influenza vaccine effectiveness (VE) estimates for a given season; instead, CDC’s four U.S...