Freshwater snails and Schistosomiasis mansoni in the State of Rio de Janeiro, Brazil: II - Centro Fluminense Mesoregion

Abstract

During the course of a survey carried out from 2000 to 2001 in the Centro Fluminense Mesoregion of the State of Rio de Janeiro 22 molluscan species were found. Many of the records are new due to the dearth of previous studies. Concerning the snail hosts of Schistosoma mansoni, the most frequently encountered species was Biomphalaria tenagophila, as it occurred in all the surveyed municipalities. There are new records of Biomphalaria straminea and Biomphalaria peregrina which is regarded as a potential intermediate host. Drepanotrema lucidum and Antillorbis nordestensis were found to be shedding echinostome cercariae and strigid cercariae respectively. An account about the current schistosomiasis transmission sites in this Mesoregion is presented as well

Freshwater snails and schistosomiasis mansoni in the state of Rio de Janeiro, Brazil: V - Norte fluminense mesoregion

“…In contrast to the other previously studied Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a(Thiengo et al b, 2004) B. tenagophila was the only schistosomiasis vector found and the most frequent species, as it was observed in 34 districts.…”

“…With regard to other trematode, the xiphidiocercariae group was the most frequently larval type found in the molluscs, corroborating Thiengo et al (2002aThiengo et al ( b, 2004.…”

“…The present study extended the geographical distribution of B. tenagophila in the state of Rio de Janeiro (Paraense 1986, Thiengo et al 1998, 2001, 2002ab, 2004 In relation to the non-vector planorbid species, D. anatinum was the most common, followed by D. cimex. In the previously studied mesoregions, the most frequent species were D. anatinum in the Metropolitana and Centro Fluminense Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a, D. cimex in the Baixadas Mesoregion (Thiengo et al 2002b) and D. lucidum in the Sul Fluminense Mesoregion (Thiengo et al 2004).…”

“…In the previously studied mesoregions, the most frequent species were D. anatinum in the Metropolitana and Centro Fluminense Mesoregions (Thiengo et al 2001(Thiengo et al , 2002a, D. cimex in the Baixadas Mesoregion (Thiengo et al 2002b) and D. lucidum in the Sul Fluminense Mesoregion (Thiengo et al 2004). The distribution of A. nordestensis, previously known in 28 municipalities in the state (Thiengo et al 1998, Santos et al 1999, Thiengo et al 2001, 2002ab, 2004, is now extended to include Campos, Conceição de Macabu, Macaé, and São Fidélis.…”

“…Of the remaining Pulmonata species, P. marmorata was found most frequently (8 municipalities; 27 districts) similarly to Baixadas, Centro and Sul Fluminense Mesoregions (Thiengo et al 2002a(Thiengo et al b, 2004.…”