Urban and suburban malaria in Rondônia (Brazilian Western Amazon) II: perennial transmissions with high anopheline densities are associated with human environmental changes

Memórias do Instituto Oswaldo Cruz

Luiz Herman Soares Gil²  Mauro Shugiro Tada¹  Tony Hiroshi Katsuragawa¹  Paulo Eduardo Martins Ribolla¹  Luiz Hildebrando Pereira Da Silva¹ 

[1] ,Instituto de Pesquisa em Patologias TropicaisPorto Velho RO ,Brasil

关键词: anopheline;    urban malaria;    Brazilian Amazon;   

DOI  :  10.1590/S0074-02762007005000013

来源: SciELO

【 摘 要 】

Longitudinal entomological surveys were performed in Vila Candelária and adjacent rural locality of Bate Estaca concomitantly with a clinical epidemiologic malaria survey. Vila Candelária is a riverside periurban neighborhood of Porto Velho, capital of the state of Rondônia in the Brazilian Amazon. High anopheline densities were found accompanying the peak of rainfall, as reported in rural areas of the region. Moreover, several minor peaks of anophelines were recorded between the end of the dry season and the beginning of the next rainy season. These secondary peaks were related to permanent anopheline breeding sites resulting from human activities. Malaria transmission is, therefore, observed all over the year. In Vila Candelária, the risk of malaria infection both indoors and outdoors was calculated as being 2 and 10/infecting bites per year per inhabitant respectively. Urban malaria in riverside areas was associated with two factors: (1) high prevalence of asymptomatic carriers in a stable human population and (2) high anopheline densities related to human environmental changes. This association is probably found in other Amazonian urban and suburban communities. The implementation of control measures should include environmental sanitation and better characterization of the role of asymptomatic carriers in malaria transmission.

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