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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.
To evaluate the effectiveness of the 2025-2026 COVID-19 vaccine in providing short-term protection against medically attended COVID-19 among immunocompetent adults.
Approach:
Study Design: A test-negative case-control study using data from the VISION Network, including 253 ED/UC sites and 179 hospitals across 7 US states.
Population: Patients aged 18 years or older who sought care for COVID-19-like illness and underwent SARS-CoV-2 testing from September 3 to December 31, 2025.
Vaccine Effectiveness Estimation: Compared the odds of vaccination among cases (positive SARS-CoV-2 test) vs controls (negative test), adjusting for age, sex, race, ethnicity, calendar time, and geographic region.
Key Findings:
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Interpretation:
Limitations:
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Conclusion:
The study highlights the short-term effectiveness of the 2025-2026 COVID-19 vaccine in a specific population during the early respiratory virus season.
