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Susceptibility of Bulinus (Physopsis) globosus and Bulinus truncatus rohlfsi from different localities in Ghana to different local strains of Schistosoma haematobium



Susceptibility of Bulinus (Physopsis) globosus and Bulinus truncatus rohlfsi from different localities in Ghana to different local strains of Schistosoma haematobium



Ann. trop. Med. Parasit 62(1): 13-26



The susceptibility oi Bulinus (Physopsis) globosusand B. truncatus rohlfsi from different regions of Ghana to regional strains of Schistosoma haematobium was investigated. Snails were exposed individually for 2 to 3 hours to about 10 miracidia each and were observed for 65 days following exposure. Groups of 2 to 3 mice were exposed to cercariae from individual infected snails. After 90 to 100 days the mice were dissected and adult worms estimated. Strains of 5. haematobium from areas where either B. globosus or B. truncatus rohlfsi were exclusively present, showed significant compatibility with their local snail species and partial or complete incompatibility with the other. Where the 2 snail species were present together, the parasite was always significantly more adapted to one host (usually B. globosus) than to the other. B. truncatus rohlfsi and the associated "truncatus" schistosome strains were relatively homogeneous; snails of different populations were about equally susceptible to "truncatus" strains from different regions of Ghana. B, globosus and the associated "globosus" strains were highly heterogeneous; the different snail populations were variable in their potential susceptibility to infection, in their survival during infection and in their relationships with the invading parasites. The "globosus" and "truncatus" schistosome strains differ in their natural sex ratio and in the survival rate of the invading miracidia.

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Accession: 014705446

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PMID: 5692870

DOI: 10.1080/00034983.1968.11686525


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