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Related Experiment Videos

Do untreated bednets protect against malaria?

S E Clarke1, C Bøgh, R C Brown

  • 1Danish Bilharziasis Laboratory, Jaegersborg Allé 1D, DK-2920 Charlottenlund, Denmark. sc@bilharziasis.dk

Transactions of the Royal Society of Tropical Medicine and Hygiene
|November 15, 2001
PubMed
Summary

Untreated bednets offer significant protection against malaria, even in areas with low insecticide retreatment rates. This study found that untreated nets provided substantial malaria prevention, especially for children in poorer households.

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Area of Science:

  • Medical Entomology
  • Infectious Diseases
  • Public Health

Background:

  • Insecticide-treated bednets (ITNs) are standard for malaria control, but concerns exist regarding the efficacy of untreated nets.
  • Regular insecticide retreatment of bednets is considered crucial, yet low rates are reported in many African programs.
  • The potential for untreated nets to increase malaria risk in non-users due to mosquito diversion is a concern.

Purpose of the Study:

  • To evaluate the protective benefit of untreated bednets against malaria in The Gambia.
  • To assess if untreated nets pose a risk to individuals sleeping without them.

Main Methods:

  • Cross-sectional prevalence surveys conducted in 48 villages in The Gambia.
  • Comparison of malaria parasitaemia risk in young children sleeping with versus without untreated bednets.

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  • Analysis adjusted for household wealth differences.

    • Main Results:

    • Use of an untreated bednet in good condition was associated with a 51% reduction in Plasmodium falciparum infection prevalence.
    • Children in the poorest households showed the greatest benefit, with a 62% protection rate.
    • No evidence of increased mosquito bites or malaria risk for children sleeping without nets.

    Conclusions:

    • Untreated bednets, if in good condition, provide significant protection against malaria.
    • Public health interventions should consider promoting untreated nets, particularly targeting the poorest populations.
    • Concerns about mosquito diversion to non-users were not supported by the findings.