Biological and morphological characteristics of Schistosoma mansoni from Ribeira Valley, state of Säo Paulo, Brazil I--Susceptibility of Biomphalaria tenagophila snail to sympatric S. mansoni strain
Rev. Inst. Med. Trop. Säo Paulo
; 34(3): 199-203, maio-jun. 1992. tab, graf
Article
em En
| LILACS
| ID: lil-134504
Biblioteca responsável:
BR66.1
RESUMO
In the Säo Paulo State, Brazil, where the Biomphalaria tenagophila is the intermediate host, the Ribeira Valley is an important endemic schistosomiasis mansoni area. During last eleven years there has been intense control measures focusing on schistosomiasis. The efforts have been concentrated in the municipalities of Pedro de Toledo and Itariri. We determined the susceptibility of B. tenagophila to sympatric strain of S. mansoni, both recently isolated from Itariri field. In 1988, this strain was isolated and maintained in the experimental model Swiss mice--sympatric B. tenagophila. The second generation of the worm was evaluated. The snail were divided in the three groups of 60 snails each. One group was exposed to 1 miracidium and other to 10. The third group was the control. The mortality and the shedding of cercariae were checked during 78 days. After that, the positive snails were observed until they ceased to shed cercariae. The exposed molluscs showed mortality rates of 23% and 31% and infection indexes were of 8% and 60% to 1 and 10 miracidia respectively. The mortality was of 22% in the control group. The periods of shedding cercariae in the two groups were 82 and 104 days. We can conclude that B. tenagophila is an effective intermediate host to the sympatric strain of S. mansoni sympatric strain
Texto completo:
1
Índice:
LILACS
Assunto principal:
Schistosoma mansoni
/
Biomphalaria
/
Vetores de Doenças
Tipo de estudo:
Prognostic_studies
Limite:
Animals
País/Região como assunto:
America do sul
/
Brasil
Idioma:
En
Revista:
Rev. Inst. Med. Trop. Säo Paulo
Assunto da revista:
MEDICINA TROPICAL
Ano de publicação:
1992
Tipo de documento:
Article