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Factors involved in immunization program for swine influenza.

G O Broun, D O'Connor, R R Schmidt

    The American Journal of Medicine
    |December 11, 1976
    PubMed
    Summary

    Individuals under 43 lack swine influenza immunity, necessitating vaccination. This age group experienced high mortality in 1918 and requires special consideration, particularly women of childbearing age.

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    Area of Science:

    • Immunology
    • Epidemiology
    • Public Health

    Background:

    • Swine influenza (H1N1) poses a potential public health threat.
    • Assessing population immunity is crucial for vaccination program decisions.
    • Historical pandemics highlight specific age groups at higher risk.

    Purpose of the Study:

    • To evaluate the immunity status of different age groups against H1N1 swine influenza.
    • To inform vaccination strategies based on age-specific immunity and historical mortality data.
    • To consider the implications for vulnerable populations, including women of childbearing age and newborns.

    Main Methods:

    • Serum samples collected from individuals born between 1889 and 1943.
    • Hemagglutinin inhibiting (HI) antibody titers tested against H1N1 strains from 1931 and 1976.
    • Analysis of age-specific antibody levels to infer population immunity.

    Main Results:

    • Individuals under 43 years of age demonstrated no detectable antibody protection against H1N1.
    • Historical data indicates exceptionally high mortality in the 15-44 age group during the 1918 pandemic.
    • This unprotected age group includes women of childbearing age, a demographic with increased pandemic mortality in 1918 and 1957.

    Conclusions:

    • Nationwide vaccination against swine influenza is recommended, prioritizing individuals under 43.
    • Special attention should be given to women of childbearing age due to heightened pandemic risks.
    • Further consideration of maternal antibody transfer and immunity levels in relation to chronic diseases is warranted.

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