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Rubella seroconversion following immunization in a rural practice.

J C Hough, R B Walker, J W Brough

    The Journal of Family Practice
    |October 1, 1979
    PubMed
    Summary
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    Many children with verified rubella immunization lack protective antibody titers. This lack of protection was not linked to age at immunization or time elapsed since vaccination.

    Area of Science:

    • Immunology
    • Public Health
    • Virology

    Background:

    • Rubella immunization is crucial for preventing congenital rubella syndrome.
    • Maintaining adequate antibody titers post-vaccination is essential for long-term immunity.
    • Previous studies suggest variable long-term immunity following rubella vaccination.

    Purpose of the Study:

    • To assess the prevalence of protective rubella antibody titers in immunized individuals.
    • To investigate the influence of age at immunization and time since vaccination on antibody titers.
    • To evaluate the long-term effectiveness of rubella immunization in a rural population.

    Main Methods:

    • A cohort of 102 patients with confirmed rubella immunization was studied.
    • Hemagglutination Inhibiting (HI) antibody titers were measured.

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  • Data on age at immunization and time since immunization were collected and analyzed.

    • Main Results:

    • 22.5% of participants had HI antibody titers below the protective threshold of 1:8.
    • No significant difference in protective titers was observed based on immunization age (15 months).
    • No correlation was found between time elapsed since immunization and the proportion of seroconversion.

    Conclusions:

    • A substantial proportion of individuals with documented rubella immunization do not possess protective antibody levels.
    • Neither age at immunization nor time since vaccination appears to significantly impact the maintenance of protective rubella antibody titers.
    • These findings highlight potential gaps in long-term rubella immunity following standard vaccination protocols.