Clinical Report: Updated COVID Shot Linked to Added Protection
Overview
The 2025-2026 COVID-19 vaccine demonstrated 50% effectiveness against emergency department visits and 55% against hospitalizations among immunocompetent adults.
Background
The ongoing evolution of SARS-CoV-2 necessitates continuous updates to vaccination strategies. Understanding the effectiveness of new vaccine formulations is crucial for public health, especially as COVID-19 continues to impact healthcare systems.
Data Highlights
| Outcome | Effectiveness |
|---|---|
| ED/UC Encounters | 50% |
| Hospitalizations | 55% |
Key Findings
- The 2025-2026 COVID-19 vaccine showed 50% effectiveness against COVID-19-associated ED/UC encounters.
- Effectiveness against COVID-19-associated hospitalization was estimated at 55%.
- Among adults aged 65 years or older, effectiveness was 48% for ED/UC encounters and 53% for hospitalizations.
- Findings primarily reflect short-term protection, with median time since vaccination being 47 days for ED/UC encounters.
- The study included data from 253 ED/UC sites and 179 hospitals across 7 US states.
- COVID-19 was associated with an estimated 390,000 to 550,000 hospitalizations in the US from October 2024 to September 2025.
Clinical Implications
Healthcare providers should consider the effectiveness of the 2025-2026 COVID-19 vaccine when advising patients.
Conclusion
The interim data indicates that the 2025-2026 COVID-19 vaccine provides significant protection against severe outcomes in adults.
Related Resources & Content
- CDC, Interim Estimated Effectiveness of 2025-2026 COVID-19 Vaccines in Adults Using a Test-Negative Design, 2025 -- Vaccine Effectiveness Study
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- 2025–2026 COVID-19 Vaccination Guidance | Covid | CDC
- COVID-19 Vaccines (2025-2026 Formula) for Use in the United States Beginning in Fall 2025 | FDA
- Implementation Guidance | Covid | CDC
- Overview of COVID-19 Vaccines and Vaccination | Covid | CDC
- ACIP Recommends COVID-19 Immunization Based on Individual Decision-making | HHS.gov
- Interim Estimated Effectiveness of 2025-2026 COVID-19 Vaccines in Adults Using a Test-Negative Design - PubMed
- Interim Estimated Effectiveness of 2025-2026 COVID-19 Vaccines in Adults Using a Test-Negative Design - PMC
- Interim Estimates of 2024–2025 COVID-19 Vaccine Effectiveness Among Adults Aged ≥18 Years — VISION and IVY Networks, September 2024–January 2025 | MMWR
- https://cdn.who.int/media/docs/default-source/crs-crr/2026-04-01-epiwin_grt-mcm.pdf?sfvrsn=7a98f6bb_1
- https://cdn.who.int/media/docs/default-source/_sage-2026/final-highlights_18-march-2026.pdf
- IDSA 2025 Guidelines on the Use of Vaccines for the Prevention of Seasonal COVID-19, Influenza, and RSV Infections in Immunocompromised Patients | Clinical Infectious Diseases | Oxford Academic
- ACP Says Adults at Increased Risk Should Get an mRNA-Based COVID-19 Vaccine | ACP Online
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