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Measles imported by returning U.S. travelers aged 6-23 months, 2001-2011

    MMWR. Morbidity and Mortality Weekly Report
    |April 8, 2011
    PubMed

    Insights

    Seven unvaccinated U.S. infants contracted measles from imported cases in early 2011, highlighting risks for young travelers. Early vaccination is crucial for children traveling internationally to prevent measles exposure.

    Area of Science:

    • Epidemiology
    • Public Health
    • Vaccinology

    Background:

    • Measles is a highly contagious viral illness that remains endemic globally.
    • Young children, particularly those aged 6-23 months, are at increased risk for severe measles complications, including death and subacute sclerosing panencephalitis.
    • Imported measles cases pose a threat to unvaccinated populations, especially young children traveling internationally.

    Purpose of the Study:

    • To analyze imported measles cases in U.S. travelers aged 6-23 months reported in early 2011.
    • To compare these cases with imported measles cases from previous years (2001-2010).
    • To assess the vaccination status of young U.S. travelers diagnosed with imported measles.

    Main Methods:

    • Analysis of data from the National Notifiable Diseases Surveillance System (NNDSS).
    • Inclusion of data from January 2001 to February 2011.
    • Focus on imported measles cases in U.S. residents, specifically children aged 6-23 months.

    Main Results:

    • Seven imported measles cases were reported in U.S. travelers aged 6-23 months in January-February 2011; four required hospitalization.
    • None of the seven children had received the measles, mumps, and rubella (MMR) vaccine prior to travel.
    • During 2001-2010, 47 imported measles cases were reported in U.S. children aged 6-23 months, with only three vaccinated prior to travel.

    Conclusions:

    • Measles remains a significant risk for international travelers, especially young children.
    • Up-to-date vaccination, including the MMR vaccine, is essential for all international travelers.
    • Advisory Committee for Immunization Practices (ACIP) recommends earlier MMR vaccination for U.S. children traveling or living abroad due to increased exposure risk.

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