Re-Evaluation of Schistosomiasis Mansoni in Minas Gerais, Brazil. Iii. "Noroeste De Minas" Mesoregion

Abstract

This study was conducted to assess the presence of schistosomiasis mansoni in the "Noroeste de Minas" mesoregion, an area considered non-endemic. A malacologic survey and parasitologic stool examinations were undertaken in 13 municipalities of the mesoregion. A sample of 3,283 primary school students was submitted to fecal examination by the Kato-Katz method. A total of 3,627 planorbids was collected and examined. The molluscs were identified as Biomphalaria straminea in seven municipalities (Unaí, Bonfinópolis de Minas, Paracatu, Jaão Pinheiro, Vazante, Lagamar and Lagoa Grande) and as Biomphalaria peregrina in one (Presidente Olegário). All planorbids were negative for Schistosoma mansoni. Four students were diagnosed with schistosomiasis in the municipalities of Buritis, Formoso, Paracatu and Unaí, but none of these cases was considered autochthonous. The data obtained indicate that the "Noroeste de Minas" mesoregion continues to be non-endemic for schistosomiasis mansoni, although the presence of intermediate hosts associated with parasitized individuals emphasizes the need for epidemiological surveillance of schistosomiasis in this mesoregion.

A Study of Schistosomiasis Prevalence and Risk of Snail Presence Spatial Distributions Using Geo-Statistical Tools

“…This species has been epidemiologically linked to the occurrence of cases of schistosomiasis in Paracatu in Minas Gerais (Carvalho et al, 1988). Working in non-endemic regions in Minas Gerais (Carvalho et al, 1994(Carvalho et al, , 1997(Carvalho et al, , 1998a (Pellon & Teixeira, 1950;Katz et al, 1978;Lambertucci et al, 1987). In endemic areas, large concentrations of these molluscs, together with other risk factors, favour the existence of cities with a high prevalence of schistosomiasis.…”

“…High prevalence (greater than 15.0%) was found in 40.5% of the studied municipalities (SES, 2006). Carvalho et al (1987Carvalho et al ( , 1988Carvalho et al ( , 1989Carvalho et al ( , 1994Carvalho et al ( , 1997Carvalho et al ( , 1998a, Katz & Carvalho (1983), Campos & Briques (1988), Kloss et al (2004), Gazzinelli et al (2006), Enk et al (2008Enk et al ( , 2009, Massara et al (2008) and Tibiriça (2008) also published results of schistomiasis prevalence studies in Minas Gerais state. Finally, Drummond et al (2010) reported that the PCE examined 2,643,564 stool samples in the period of 2003-2007 and obtained 141,284 positives for S. mansoni in Minas Gerais.…”

Esquistossomose mansoni em duas mesorregiões do Estado de Alagoas

“…O estudo da distribuição geográfica dos moluscos vetores da doença no Brasil deve persistir, mormente nas regiões onde sua importância epidemiológica ainda não está estabelecida. Aliás, vem sendo observado nas últimas décadas, um progresso nos estudos visando melhor conhecimento da fauna planorbídica 4 Na mesorregião do leste Alagoano, onde B. glabrata foi encontrada em 20 dos 28 municípios estudados, verifica-se abundância de poços e depois, de riachos. Poços e riachos não sujeitos à dessecação favorecem o desenvolvimento da espécie 32 .…”