A time in contact with the parasite the host will be able to indicate a state of pathogenic action of the same. However, the pathogenicity absence is rare, of short duration and, many times, depend on the evolutiva phase of the parasite. In general, the riots that occur are of small sum, therefore it has a trend to have a balance enters the action of the parasite and the capacity of resistance of the host. (SNOWS, 2000). The initiated parasatisms are disclosed of diverse forms: benign or serious and mortal, typical or atypical, clear or inexact acute or chronicles, (CARRERA, 1979).
Some problems provoked for the intestinais parasatisms exist, being the most frequent gastrointestinal and nervous malnutrition, problems, that can take the reduction of the capacity of learning for parasitadas children. Easy problems to be decided with politics of sanitary education and engineering, beyond therapeutical measures and changes of some cultural habits. Currently, it has few works showing the reality of enteroparasitoses on the intensity of the infections and its relation with pointers of partner-economic levels of the population in our country, especially in the city of Par-of-Minas/MG. Esquistossomose (S.mansoni) is an endemic illness in Minas Gerais. STEPS and AMARAL (1998) had presented the prevalences esteem for Estado, of data collected for the National Foundation of Sade (FUNASA), demonstrating an increase in the prevalence in Minas Gerais, in 1997 and 1998, when compared the 1996.
The data presented for KATZ and PEIXOTO (2000) indicate prevalence of 8,97% for 1996 and 7,84% for 1997, corresponding about a million and way of sick people with 15 displayed million to the risks of the illness in the State. The raised tax of prevalence associated with the direct consequences on the health state of the populations human beings becomes esquistossomose an important problem of public health in tropical and subtropical areas. By being transmitted through water collections candy, between diverse other factors, its occurrence can be potencializado, as much for the resultant space expansion of the population movements, how much for the construction of barrages and the exploitation of the same ones for subsequent workmanships, as irrigation (MARTINS Jr & BARRETO, 2003).