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    Area of Science:

    • Public Health
    • Epidemiology
    • Vaccinology

    Background:

    • Measles was eliminated in the U.S. in 2000 due to high childhood vaccination rates.
    • Measles cases and outbreaks persist due to imported cases and low vaccination coverage in specific communities.
    • Recent outbreaks underscore the vulnerability of unvaccinated populations to measles transmission.

    Purpose of the Study:

    • To analyze the characteristics and impact of a multistate measles outbreak in early 2025.
    • To identify contributing factors to the outbreak, including vaccination status and community transmission.
    • To inform public health strategies for measles prevention and control.

    Main Methods:

    • Retrospective analysis of reported measles cases from January to April 2025.
    • Data collection on case demographics, vaccination status, hospitalization, and outcomes.
    • Investigation of outbreak origins, including international importation and community spread patterns.

    Main Results:

    • An outbreak in New Mexico, Oklahoma, and Texas accounted for 82% of 800 reported U.S. cases in 2025.
    • 96% of patients were unvaccinated or had unknown vaccination status.
    • The outbreak led to a 180% increase in cases compared to 2024, with hospitalizations and three deaths.

    Conclusions:

    • Low vaccination coverage in close-knit communities facilitates large measles outbreaks.
    • Public health interventions must prioritize increasing measles, mumps, and rubella (MMR) vaccination coverage.
    • Community engagement and culturally competent approaches are crucial for effective outbreak prevention.