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[Experimental antitriatomic program in Santiago].

A Neghme1, H Schenone, F Villarroel

  • 1Departamento de Microbiología y Parasitología, Facultad de Medicina, Universidad de Chile, Santiago.

Boletin Chileno De Parasitologia
|July 1, 1991
PubMed
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A public health program in Santiago, Chile, used lindane insecticide to combat Triatoma infestans, the vector for Chagas disease. This initiative significantly reduced infested dwellings and protected thousands from infection.

Area of Science:

  • Vector-borne disease control
  • Public health entomology
  • Chagas disease epidemiology

Background:

  • Rapid urbanization in Latin America led to informal settlements with poor housing materials, creating ideal habitats for triatomine bugs.
  • Increased reports of Triatoma infestans in Santiago dwellings prompted a public health intervention to control Chagas disease vectors.
  • The study addresses the challenge of vector control in peri-urban and rural areas susceptible to Chagas disease transmission.

Purpose of the Study:

  • To implement and evaluate an experimental program for the control of Triatoma infestans, the primary vector of Chagas disease in Santiago, Chile.
  • To reduce the prevalence of triatomine bug infestations in dwellings through insecticide application and community engagement.
  • To protect the population from Chagas disease transmission by eliminating or reducing vector populations.

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Main Methods:

  • A community-wide spraying program utilizing 1% lindane insecticide was conducted in infested dwellings and surrounding areas (within 100m).
  • Two applications of lindane were performed, with a second application between 30 and 120 days after the first to target unaffected triatomine bugs.
  • The program incorporated health education to encourage active community participation in reporting vector presence and cooperating with control measures.

Main Results:

  • A total of 32,708 dwellings were sprayed twice with lindane, protecting 191,090 people from Triatoma infestans bites.
  • Infestation rates in dwellings decreased significantly, from 18.7% to 3.0% based on resident reports and from 3.0% to 0.3% based on insect collection.
  • The study period (1960-1972) saw a substantial reduction in vector populations, contributing to Chagas disease prevention.

Conclusions:

  • The experimental program demonstrated the effectiveness of lindane spraying and health education in controlling Triatoma infestans populations.
  • The reduction in infested dwellings highlights the success of integrated vector management strategies in urbanizing areas.
  • The long-term impact includes the eventual demolition and replacement of many sprayed dwellings, indicating urban development alongside disease control efforts.