Dinâmica na transmissão de bilharziose urinária nas áreas sub-urbanas das Cidades de Maputo e Matola

Abstract

The objective of the present study was to assess the dynamics of urinary bilharzia transmission, particularly the fluctuations in Bulinus sp density, as well as to obtain information on the infection rate in the suburban areas of Maputo and Matola cities. The study was carried out over a period of 12 months from September 2003 to August 2004. The results show that in the study area there is the Bulinus sp group with two species Bulinus globosus and Bulinus africanus, both vectors of Schistosoma haematobium and other species of intermediate vectors but not of the urinary form which are; Biomphalaria pfeifferi, Lymnaea natalensis, and Bulinus forskalii. The typical vegetation of the study area was composed of Eichhomia crass ipes, Lemna sp, Nymphaea capensis, Phragmites australis and mosses. The density of Bulinus sp showed seasonal fluctuations. In general, it is high during the months of November/December and March, which corresponds to the hot and rainy season, where temperature and rainfall are high, and shows a decrease from the end of March, after the rainy season which lasts until the end of the cold and dry season, followed by an increase at the beginning of the rainy season. Density varied from 10 to 276 snails per round over a period of 15 minutes. The vector infection rate was epidemiologically high, ranging from 0 to 11.8%. The annual infection rate peaks were recorded in January, February, April and May, being respectively Zona Verde with 0.80%, Costa do Sol 11.8%, Vale do Infulene 3.33% and Intaca 2.08%. (TRADUÇAO NOSSA)