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Last year’s revised COVID-19 vaccines significantly reduced severe illness, hospital admissions, and deaths among U.S. military veterans, according to a major study published recently in The New England Journal of Medicine. The research provides strong evidence that the 2024–2025 updated COVID vaccines continue to offer critical protection, even as the virus evolves and clinical outcomes have generally become less severe.
Key Findings
The study followed 164,132 veterans who received both the 2024–2025 COVID booster (Moderna or Pfizer-BioNTech mRNA vaccines) along with the seasonal flu vaccine, compared to 131,839 veterans vaccinated for flu only. Most participants were aged 45 and older. Compared to those without the COVID booster, vaccinated veterans experienced:
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A 29% reduction in emergency department visits related to COVID-19
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A 39% decrease in hospitalizations due to COVID-19 complications
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A 64% decline in COVID-19-related deaths
In absolute terms, vaccination led to approximately 18 fewer emergency visits, 7.5 fewer hospitalizations, and 2 fewer deaths per 10,000 patients over a six-month period. These benefits held consistent across different age groups and among individuals with chronic health conditions.
Expert Perspectives
Dr. Jesse Goodman, an expert at the Medical Center in Washington, D.C. who was not involved in the study, emphasized that “the vaccines continue to offer additional, albeit imperfect, protection against severe outcomes such as hospitalization and mortality.” Eric Rubin, editor-in-chief of The New England Journal of Medicine, also highlighted that despite the reduced severity and rarity of such outcomes compared to the pandemic’s early days, vaccination remains a viable and recommended option given its safety profile and protective benefits.
Context and Background
Since the onset of the COVID-19 pandemic, vaccines have been the cornerstone of efforts to reduce severe disease and deaths. Over time, SARS-CoV-2 has mutated, with Omicron subvariants and others emerging. The 2024–2025 vaccines were updated to target predominant variants circulating in that season, specifically Omicron KP.2 lineage for Pfizer and Moderna, and Omicron JN.1 lineage for the Novavax vaccine. While these vaccines do not entirely prevent infection, their key role is to mitigate severe disease and health system burden.
Previous studies have shown that vaccination not only protects against acute illness but also reduces the risk of Long COVID symptoms following infection. The updated vaccines build on this evidence by adapting to newer virus strains.
Public Health Implications
The findings reinforce current U.S. Centers for Disease Control and Prevention (CDC) recommendations that all persons aged six months and older receive annually updated COVID-19 vaccines, alongside other routine immunizations. For older adults and those with moderate to severe immunocompromise, additional doses may be advised.
By preventing severe cases, these vaccines help reduce emergency room visits and the strain on hospitals. This can translate into saved lives and healthcare resources, especially among vulnerable populations.
Limitations and Counterarguments
The absolute magnitude of benefit, measured in fewer hospitalizations and deaths, is lower than early pandemic figures, largely because circulating virus variants often cause milder illness and many individuals now have immunity from previous infections or vaccinations. Additionally, observational studies like this may be subject to confounding factors despite adjustments.
Concerns have been raised about the side effects and safety of repeated boosters, but severe adverse events remain rare. The net benefit-risk balance still favors vaccination, particularly given the ongoing threat posed by COVID-19 variants.
Practical Takeaway for Readers
Receiving the updated annual COVID-19 vaccine remains an important step for personal and public health protection. Individuals, especially those aged 45 and above or with chronic health issues, can lower their risks of serious outcomes even amid evolving virus strains. Vaccination combined with other preventive measures continues to be a reliable approach to managing COVID-19 risks.
Medical Disclaimer: This article is for informational purposes only and should not be considered medical advice. Always consult with qualified healthcare professionals before making any health-related decisions or changes to your treatment plan. The information presented here is based on current research and expert opinions, which may evolve as new evidence emerges.
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