Avaliação da vulnerabilidade do potencial de endemização da esquistossomose mansônica no Distrito de Mosqueiro Belém, Pará

Abstract

Schistosomiasis mansoni (SM) is an endemic parasitic disease that occurs in at least 74 countries with illness of 25 million people, including Brazil. It is related to socioeconomic and environmental factors, with emphasis on migratory movements that contribute to the spread of this disease. In northern Brazil only the state of Para has focus of this disease, the main in the city of Belem.The urban sprawl through the occupation of peripheral areas of the metropolitan area of Belem has generated significant social and environmental impacts, reaching areas of environmental preservation.From an ecosystemic perspective, the study assessed the possibility of expansion of SM in the insular area of the one administrative districts of Belem, in Mosqueiro (DAMOS), where there was the environmental characterization, malacological, parasitological and population surveys. Georeferencing techniques were used for spatial analysis of the study area, interview questionnaire at home and collection of material for parasitological examination. The approach adopted for determining the sample size calculation was based on the territory coverage of the family health strategy of the Belem Municipal Health Department. Thus, was realized the zoning of the study area, where Biomphalaria sp. breeding places were found. And was adopted a 50m radius buffer (north, south, east, west), from each breeding. Inside this area size, with the help of GPS technology, has set up a sample of 491 households with an estimate of 5.31 residents per household, with the exclusion of closed or abandoned households obtained the sample of 283 households for visitation with 421 participants. It was necessary to create the schistosomiasis vulnerability index (SVI) for better information with regard the interpretation of the data. The results showed that the DAMOS presents all environmental and population characteristics of the different endemic areas of Brazil; the malacological survey identified 30 breeding of planorbids; presence of the species B. straminea not infected with S. Mansoni; very low sewage network coverage, water and increase the migratory process in disordered occupation areas with populations from endemic areas for SM.The majority of study participants reside in areas considered of medium vulnerability, however 16% are in areas of high vulnerability; the area of Carananduba was considered the highest susceptibility and increased risk potential for entry of SM in Mosqueiro district.The spatial analysis of vulnerability to schistosomiasis in the study area, has led not only support the hypothesis of endemicity of SM in DAMOS, but to show where the first outbreak may occur, what and where the major risk factors are.This study may help in the management processes in public health with the implementation of preventive measures of health education, epidemiological and environmental surveillance.