Difference in the susceptibilty to certain molluscicides and Schistosoma mansoni infection of three forms Egyptian Biomphalaria glabrata

ABSTRACT

The first generation of three morphologically different forms of B. glabrata collected from Giza was compared for LC50 values susceptibility to bayluscide and copper sulfate [chemical molluscicides], Anagallis arvensis and Calendula micrantha [plant molluscicides] as well as to Schistosoma mansoni infection. Form 2 as juvenile and adult was less sensitive to C. Micrantha and A. arvensis. Form 3 as juvenile and form 1 as adult were least sensitive to CuSO4. Approximately, the same susceptibility to bayluscide was observed in the three forms, either as juvenile or adult. The sublethal concentrations of the molluscicides on the three forms of B. glabrata showed no significant difference in the growth or survival rate in-between. Form 2 was significantly higher in the egg-laying capacity. The total protein concentration was not affected, except in certain cases, where the increase was primarily due to the increase in the globulin concentrations which was observed with the marked increase observed in the urea concentration and the marked increase or inhibition in the activity of either aspartate aminotransferase [AST] or alanine aminotransferase [ALT]. The digestive gland of the three forms of B. glabrata showed a low susceptibility to infection with the local strain of S. mansoni