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[Operational aspects of Triatoma brasiliensis control]
L Diotaiuti1, O F Faria Filho, F C Carneiro
1Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, 30190-002, Brasil. diotaiut@cpqrr.fiocruz.br
Cadernos De Saude Publica
|December 19, 2000
Summary
Indigenous vector control is challenging due to reinvasion from natural habitats. A study in Ceará found houses remained infested post-spraying, highlighting the need for integrated community-based strategies for effective Triatominae control.
Area of Science:
- Vector-borne disease ecology
- Entomology
- Public health
Context:
- Indigenous Triatominae species pose challenges for vector control due to their ability to reinvade treated areas from sylvatic habitats.
- A study was conducted in Ceará, Brazil, between August 1996 and December 1997 to assess house reinfestation after insecticide spraying.
Purpose:
- To evaluate the reinfestation rates of Triatominae bugs in houses after insecticide application.
- To analyze the species composition, infestation levels, and insecticide persistence in a Brazilian county.
Summary:
- Out of 277 houses, 40.8% were reinfested (21.7% indoors, 35.4% outdoors) with 433 Triatominae collected: 207 Triatoma brasiliensis (49% indoors) and 226 Triatoma pseudomaculata (97% outdoors).
- T. brasiliensis exhibited a univoltine cycle, while T. pseudomaculata had two cycles annually.
- Four months post-spraying with deltamethrin, 9.7% of houses remained infested, primarily in peridomestic areas, with insecticide persistence up to 9 months indoors.
Impact:
- The study underscores the high potential for recolonization of treated areas, necessitating a revised operational strategy.
- An integrated approach combining traditional surveillance, community-based monitoring, selective interventions, and education is proposed for sustainable vector control.