Cercarial Chaetotaxy and Sex Differentiation of Schistosoma mansoni Deriving from Humans and Nectomys squamipes (Muridae: Sigmondontinae) in Brazil

dc.creatorFreire, Nilcéa
dc.creatorSilva, José Roberto Machado
dc.creatorSilva, Rosângela Rodrigues
dc.creatorRey, Luís
dc.date2020-10-25T18:34:54Z
dc.date2020-10-25T18:34:54Z
dc.date2002
dc.date.accessioned2023-09-26T20:45:36Z
dc.date.available2023-09-26T20:45:36Z
dc.identifierFREIRE, Nilcéa et al. Cercarial Chaetotaxy and Sex Differentiation of Schistosoma mansoni Deriving from Humans and Nectomys squamipes (Muridae: Sigmondontinae) in Brazil. Memórias do Instituto Oswaldo Cruz, Rio de Janeiro, v. 97, n. 3, p. 127-132, Jan. 2002.
dc.identifier0074-0276
dc.identifierhttps://www.arca.fiocruz.br/handle/icict/44176
dc.identifier10.1590/S0074-02762002000100023
dc.identifier1678-8060
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8863374
dc.descriptionA comparative study was made between sympatric isolates of Schistosoma mansoni: one from a wild rodent (R) Nectomys squamipes and another one from humans (H) isolated from a low endemic schistosomiasis transmission area in Brazil. Our purpose was to detect differences between them concerning chaetotaxy (number and pattern of distribution of the argentophilic papillae) of the cercariae by means of silver impregnation. No significant difference (x > 0.05) between isolates was noted. Nevertheless, a significant difference (x < 0.05) was observed in the cercarial index (ratio of the distance between the first and the second preacetabular papillae and the distance between the first and the second dorsal preacetabular papillae) of male and female cercariae in both isolates. Males presented a greater cercarial index than females. By means of multivariate analysis, male cercariae were distinguished from female cercariae through the following characteristics: average number of dorsal papillae on the right quadrant, average number of ventral middle papillae on the right quadrant (H isolate) and average number of dorsal middle papillae on the left quadrant (R isolate). The results suggest that R and H isolates belong to the same population that could complete its life cycle in rodent-snail-rodent fashion.
dc.formatapplication/pdf
dc.languageeng
dc.publisherFundação Oswaldo Cruz. Instituto Oswaldo Cruz.
dc.rightsopen access
dc.subjectSchistosoma mansoni
dc.subjectNectomys squamipes
dc.subjectDeterminação sexual
dc.subjectHospedeiro humano
dc.subjectEsquistossomose mansoni
dc.subjectBrasil
dc.subjectSchistosoma mansoni
dc.subjectCercariae chaetotaxy
dc.subjectSex determination
dc.subjectNectomys squamipes
dc.subjectHuman host
dc.subjectSchistosomiasis mansoni
dc.subjectBrazil
dc.titleCercarial Chaetotaxy and Sex Differentiation of Schistosoma mansoni Deriving from Humans and Nectomys squamipes (Muridae: Sigmondontinae) in Brazil
dc.typeArticle


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