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Predisposition to hookworm infection in humans.

G A Schad, R M Anderson

    Science (New York, N.Y.)
    |June 28, 1985
    PubMed
    Summary
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    Parasitic helminth infections are unevenly distributed. Some individuals are predisposed to heavy infections, suggesting targeted treatment strategies could be more effective for control programs.

    Area of Science:

    • Parasitology
    • Epidemiology
    • Public Health

    Background:

    • Parasitic helminth infections in human populations exhibit highly aggregated frequency distributions.
    • A small proportion of hosts harbor the majority of the parasite burden.
    • Predisposition to heavy infection may be influenced by genetic, ecological, behavioral, or social factors.

    Purpose of the Study:

    • To provide quantitative evidence for individual predisposition to heavy parasitic helminth infection.
    • To analyze patterns of hookworm reinfection in a West Bengal village.
    • To assess the implications for chemotherapy-based control program design.

    Main Methods:

    • Analysis of individual post-treatment hookworm reinfection patterns.
    • Study conducted among 112 villagers in an endemic area of West Bengal.

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    Main Results:

    • Quantitative evidence supports the hypothesis that individuals are predisposed to heavy hookworm infection.
    • Reinfection patterns varied significantly among individuals.
    • Observed aggregation supports non-random distribution of worm burdens.

    Conclusions:

    • Individual predisposition plays a significant role in the aggregation of parasitic helminth infections.
    • Findings suggest potential economic advantages for selective or targeted chemotherapy strategies.
    • Mass treatment may be less efficient than targeted approaches for helminth control.