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A diphtheria outbreak in Dade County, Florida

C H Hennekens, M S Saslaw

    Southern Medical Journal
    |June 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Prompt mass vaccination campaigns can effectively halt diphtheria outbreaks. This 1969 Miami epidemic highlights the critical need for routine childhood immunizations to prevent future cases and reduce mortality.

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    Area of Science:

    • Epidemiology
    • Infectious Diseases
    • Public Health

    Background:

    • Diphtheria outbreaks pose significant public health risks, particularly in vulnerable communities.
    • A notable diphtheria epidemic occurred in Miami, Dade County, Florida, in late 1969, with 11 cases and 3 fatalities.
    • The outbreak was concentrated in a low socioeconomic, predominantly Black community within the Model City area.

    Purpose of the Study:

    • To analyze the 1969 Miami diphtheria epidemic.
    • To evaluate the impact of mass vaccination efforts on controlling the outbreak.
    • To emphasize the importance of routine immunization for diphtheria prevention.

    Main Methods:

    • Case investigation and contact tracing were conducted.
    • Microbiological cultures were used to identify toxigenic Corynebacterium diphtheriae, mitis strain.

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  • Mass vaccination with diphtheria-tetanus-pertussis vaccine or tetanus-diphtheria toxoid was administered to residents.

    • Main Results:

    • Eleven cases of diphtheria, including three deaths, were reported during a 16-week period.
    • All affected individuals and their unvaccinated household contacts tested positive for toxigenic C. diphtheriae.
    • Over 90,000 residents in the Model City area received at least one vaccine dose during the outbreak.

    Conclusions:

    • Mass vaccination campaigns are effective in aborting the spread of epidemic diphtheria.
    • The Miami experience underscores the necessity of routine vaccination programs to minimize diphtheria morbidity and mortality.
    • Subsequent implementation of a school entry vaccination law led to a five-year period without reported diphtheria cases.