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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 95, No. 6, 2000, pp. 839-842
Bioline Code: oc00134
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 95, No. 6, 2000, pp. 839-842

 en Differences in Brazilian Strains of Schistosoma mansoni Evaluated by Means of Morphometric Analysis of Cercariae of Both Sexes
José Roberto Machado-Silva; Cléber Hooper da Silva; Mário José dos Santos Pereira; Regina Maria Figueiredo de Oliveira; Roberto Magalhães Pinto & Delir Corrêa Gomes


Morphometrics of Brazilian strains (BH, SJ and CMO) of Schistosoma mansoni cercariae were obtained with a computerized image analyzer (IMAGE PRO PLUS, MEDIA CYBERNETICS), considering the following characters: body area, tail, furcae, oral and ventral suckers and distance between them. For statistical analysis, the variance test (one-way Anova) was applied and significant differences of p{ 0.05 were considered. All morphometric values in the BH strain were significantly higher (p{ 0.05) than in the others. Lower values were obtained in females of SJ strain for all characters, excepting the body area. Only this character showed to be significantly different in males and females of the three strains. Specimens of both sexes in the BH and SJ strains showed significant differences regarding all characters. It was observed that this morphometric analysis permits the characterization of strains and also the sex identification in S. mansoni cercariae. Due to its feasibility, this method can be applied as a tool in laboratories devoid of more complex equipment.

Schistosoma mansoni, cercariae, strains, morphometrics

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