Article
Infection by Schistosoma mansoni Sambon 1907 in the First Four Months of Life of Biomphalaria straminea (Dunker, 1848) in Brazil
Registration in:
FERNANDEZ, Monica Ammon. PIERI, Otávio Sarmento. Infection by Schistosoma mansoni Sambon 1907 in the First Four Months of Life of Biomphalaria straminea (Dunker, 1848) in Brazil. Memórias do Instituto Oswaldo Cruz, Rio de Janeiro, v. 96, Suppl. p. 185-192, 2001.
0074-0276
10.1590/S0074-02762001000900029
1678-8060
Author
Fernandez, Monica Ammon
Pieri, Otávio Sarmento
Abstract
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.