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Revaccination against measles--a pilot study.

G I Watson, J A Nichols, J R Robshaw

    The Journal of the Royal College of General Practitioners
    |December 1, 1975
    PubMed
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    Measles vaccine antibody levels decline over time, especially after inactivated-live vaccines. Revaccination is recommended within 10-15 years, particularly for those with lower initial antibody titers, to ensure sustained immunity.

    Area of Science:

    • Immunology
    • Vaccinology
    • Public Health

    Background:

    • Measles vaccination is crucial for preventing disease.
    • Understanding long-term antibody persistence after different vaccination schedules is vital for public health strategies.
    • Previous studies indicated a decline in antibody titers post-vaccination, necessitating investigations into revaccination efficacy.

    Purpose of the Study:

    • To evaluate the decline of hemagglutination inhibition (HAI) antibody titres after primary measles vaccination using live attenuated and inactivated-live (K+L) vaccines.
    • To assess the effectiveness of revaccination in boosting antibody levels at different time points post-primary immunization.
    • To determine factors influencing antibody response to revaccination, including vaccine type, time since primary vaccination, and age at vaccination.

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    Main Methods:

    • Longitudinal study tracking HAI antibody titres in children following primary measles vaccination.
    • Comparison of antibody decline rates between live attenuated vaccines and inactivated-live (K+L) vaccines.
    • Analysis of antibody responses following revaccination at 5-10 years post-primary immunization, correlating with pre-revaccination titres and time elapsed.

    Main Results:

    • Live attenuated measles vaccines showed a slow decline in HAI antibody titres over ten years, while K+L vaccines demonstrated a steeper decline.
    • Geometric Mean Titres (GMT) remained above protective levels for extended periods with live vaccines but could fall below protective levels sooner with K+L vaccines.
    • Revaccination elicited a significantly higher percentage of antibody rise in children previously vaccinated with K+L vaccine (41%) compared to live vaccine alone (5%).

    Conclusions:

    • The type of primary measles vaccination significantly impacts long-term antibody persistence and the need for revaccination.
    • Revaccination within 10-15 years of primary immunization is recommended, especially for individuals with lower pre-revaccination antibody titres.
    • Further research is needed to optimize revaccination strategies, including the potential use of less attenuated strains for booster doses.