Infection by Schistosoma mansoni Sambon 1907 in the first four months of life of Biomphalaria straminea (Dunker, 1848) in Brazil
Mem. Inst. Oswaldo Cruz
;
96(suppl): 185-192, Sept. 2001. tab
Article
in English
| LILACS
| ID: lil-295889
RESUMO
Compatibility between Schistosoma mansoni and Biomphalaria straminea when exposed to the parasite on the first four months of age was assessed for five parasitological aspects indices of infection and mortality, duration of precercarial and cercarial periods, and rate of cercarial emission. Infections were made on molluscs from laboratory colonies, at the following ages 8, 13, 18, 21, 53, 83 and 114 days. Two B. straminea colonies were used (Camorim, PE and Picos, PI), and one B. glabrata colony (Ressaca, MG) was used as control. The main results are as follows (I) infection was significantly associated with mollusc age, being proportionally higher in sexually immature than in mature molluscs for the three colonies; (II) for B. straminea from Camorim, mortality did not differ significantly between infected and non-infected snails; for B. straminea from Picos significantly more deaths occurred among infected than among non-infected snails, while the opposite was observed for B. glabrata from Ressaca; (III) for the three colonies, the precercarial period was significantly shorter for immature molluscs than for mature ones; (IV) the duration of the cercarial period was extremely variable for the three colonies; (V) sexual maturity did not influence cercarial emission for the three colonies
Full text:
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Index:
LILACS (Americas)
Main subject:
Schistosoma mansoni
/
Biomphalaria
/
Disease Vectors
Limits:
Animals
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Mem. Inst. Oswaldo Cruz
Journal subject:
Tropical Medicine
/
Parasitology
Year:
2001
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Fiocruz/BR
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