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Related Experiment Videos

Evidence of the development of resistance to DDT by Anopheles sacharovi in the Levant.

C GARRETT-JONES, G GRAMICCIA

    Bulletin of the World Health Organization
    |January 1, 1954
    PubMed
    Summary
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    The Anopheles sacharovi mosquito developed resistance to DDT in Lebanon after only two years of insecticide spraying. This resistance poses a significant challenge to malaria control efforts.

    Area of Science:

    • Medical Entomology
    • Vector Control
    • Insecticide Resistance

    Background:

    • Anopheles sacharovi mosquitoes reappeared in DDT-treated areas of north Lebanon.
    • Previous studies indicated DDT resistance in Anopheles sacharovi populations elsewhere.
    • Insecticide resistance threatens the efficacy of malaria vector control programs.

    Purpose of the Study:

    • To investigate the emergence of DDT resistance in Anopheles sacharovi in Lebanon.
    • To assess the impact of DDT residues on mosquito mortality.
    • To understand factors contributing to insecticide resistance development.

    Main Methods:

    • Field collections of Anopheles sacharovi in north Lebanon.
    • Laboratory bioassays exposing mosquitoes to known DDT residue levels (0.1-2.0 g/m²).
    Keywords:
    DDT/effectsMALARIA/prevention and controlMOSQUITOES

    Related Experiment Videos

  • Mortality assessment at 24 and 48 hours post-exposure, compared to earlier tests.

    • Main Results:

    • Reduced mortality rates observed in Anopheles sacharovi exposed to DDT residues (60.1% and 45.1%) compared to historical data (100%-83%).
    • Mosquitoes surviving DDT exposure had contacted lower average residue levels.
    • Evidence suggests rapid selection for DDT resistance in Lebanese Anopheles sacharovi strains.

    Conclusions:

    • DDT resistance is likely developing rapidly in Anopheles sacharovi populations in Lebanon.
    • Factors like sooty surfaces may reduce DDT efficacy, promoting resistance selection.
    • Strategic planning of malaria control campaigns is crucial to prevent or manage insecticide resistance.