Infection by Schistosoma mansoni sambon 1907 in the first four months of life of Biomphalaria straminea (Dunker, 1848) in Brazil
AUTOR(ES)
Fernandez, Monica Ammon, Pieri, Otávio Sarmento
FONTE
Memórias do Instituto Oswaldo Cruz
DATA DE PUBLICAÇÃO
2001-09
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.
Documentos Relacionados
- Susceptibility of Biomphalaria straminea (Dunker, 1848) from Serra da Mesa Dam, Goiás, Brazil to infection with three strains of Schistosoma mansoni Sambon, 1907
- Levantamento malacológico e infestação natural de Biomphalaria straminea (Dunker, 1848) por Schistosoma mansoni (Sambon, 1907) e Chaetogaster limnaei (K. von Baer, 1827) em uma bacia hidrográfica eutrofizada urbana (MG, Brasil)
- Estudo da cinetica amebocitaria em Biomphalaria glabrata (Say, 1818), Biomphalaria tenagophila (D Orbigny, 1835) e Biomphalaria straminea (Dunker, 1848), infectadas pelas linhagens LE e SJ de Schistossoma mansoni Sambon, 1907
- Estudo comparativo da fecundidade e fertilidade de Biomphalaria glabrata (Say, 1818) e Biomphalaria straminea (Dunker, 1848) em laboratório por autofecundação e fecundação cruzada
- Effects of the desiccation on Biomphalaria tenagophila (Orbigny, 1835) (Mollusca) infected by Schistosoma mansoni Sambon, 1907