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Updated COVID Shot Linked to Added Protection
Updated 2025-2026 vaccination was linked to added protection in a CDC-funded analysis that became part of a broader debate over routine vaccine monitoring.
The 2025-2026 COVID-19 vaccine provided short-term protection against medically attended COVID-19 among immunocompetent adults.
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Vaccine effectiveness was estimated at 50% against COVID-19-associated emergency department encounters and 55% against hospitalizations.
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The study analyzed data from 253 ED/UC sites and 179 hospitals across 7 US states from September 3 to December 31, 2025.
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Findings indicated similar vaccine effectiveness among adults aged 65 years or older, with 48% against ED/UC encounters and 53% against hospitalizations.
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Limitations included potential misclassification of vaccination status and low hospitalization rates, affecting statistical power for critical illness estimates.
