## Why universal COVID-19 vaccine guidance offers stronger protection than high-risk-only policies
Nine self-reliant modeling teams demonstrate that maintaining a universal COVID-19 vaccine policy yields consistent population-level benefits, reducing hospitalizations and deaths beyond high-risk-only strategies, even as immune escape shifts the timing of seasonal peaks.
Study: Scenario Projections of COVID-19 Burden in the US,2024-2025.Image Credit: Ground Picture / Shutterstock
In a recent study published in the journal JAMA Network Open, researchers projected united States (US) COVID-19 hospitalizations and deaths for April 2024-April 2025 under varying vaccination recommendations and immune escape assumptions, quantifying the benefits of each strategy.
Background
One season can still change thousands of lives: even in 2023-2024, COVID-19 killed more Americans per hospitalization than seasonal influenza. Decisions by the advisory Committee on Immunization Practices (ACIP) guide the Centers for Disease Control and Prevention (CDC) in recommending who should be vaccinated; however, the evolution of variants and waning immunity keep the goalposts moving. Communities weigh convenience, cost, and fatigue against the need for protection for older adults and people with underlying health conditions. Families and hospitals plan for expected winter peaks, yet summer surges can still come as a surprise. Policymakers need numbers, not guesswork, to set broad or targeted guidance. Further research is required to compare realistic vaccination pathways amid immune escape.
About the study
The US Scenario Modeling Hub convened nine independent teams to produce projections of COVID-19 hospitalizations and deaths from April 28, 2024, to April 26, 2025. Teams calibrated models to weekly hospital admissions from the National Healthcare Safety Network (NHSN) and deaths from the National Center for Health Statistics (NCHS), using routinely collected, anonymized surveillance. Six scenarios crossed two axes: immune escape at 20% per year (low) or 50% per year (high) for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), and vaccine policy, 1) no advice (except for vaccine-naive children aging into eligibility at 6 months); 2) recommendation only for high-risk groups (adults ≥65 years or individuals with underlying conditions); or 3) recommendation for all persons aged ≥6 months.
Vacc
COVID-19 Projections: Vaccination Remains Key to Reducing Hospitalizations and Deaths
Weekly Projections of COVID-19 Hospitalizations and Deaths in the United States During April 28, 2024, to April 26, 2025, Across 6 Scenarios of Immune Escape and Vaccination Recommendations. Ensemble projections are based on 9 models, and historical data are shown as black points. Unfilled data points represent observed data after the projection period. National Healthcare Safety Network hospitalization data are shown only where the reporting fraction was greater than 75%, highlighting the gap in reliable data during this time (May 5, 2024, to November 2, 2024).Projection curves are colored based on vaccine recommendations, with curves representing the median of the ensemble projection and shading showing the 90% projection interval. Dashed lines indicate the Centers for Disease Control and Prevention thresholds for high and medium hospital admission levels (>20 and 10-20 weekly hospitalizations per 100,000, respectively).
New modeling data suggests that continued vaccination efforts are crucial for mitigating the impact of COVID-19, even as the virus evolves. Researchers analyzed six different scenarios, considering varying levels of immune escape and different vaccination recommendations. The findings, published recently, highlight the ongoing importance of vaccination in reducing hospitalizations and deaths.
The study found that vaccination policies significantly reduced the burden of COVID-19 in all scenarios. Even recommending vaccination only for high-risk groups offered substantial benefits. Under conditions of low immune escape, this strategy reduced hospitalizations by 11% (95% confidence interval, 6%-16%). With high immune escape, hospitalizations where reduced by 8% (95% confidence interval, 5%-11%).
It’s vital to note that the projections are based on ensemble modeling, combining data from nine different models. Historical data is included for context, and the models account for uncertainties in future viral evolution and vaccination rates. The data also points to gaps in reliable hospitalization reporting between May 5, 2024, and November 2, 2024, where reporting fractions were below 75%.
These results reinforce the idea that vaccination remains a vital public health tool. While the virus continues to change, and immunity can wane, staying up-to-date with recommended vaccines can still offer important protection against severe illness, hospitalization, and death. Further research will be needed to refine these projections and adapt vaccination strategies as the pandemic evolves.