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Host-parasite Relationships of Bulinus globosus and B. truncatus with Strains of Schistosoma haematobiutm

Published online by Cambridge University Press:  18 November 2009

G. Webbe  and
C. James
G. Webbe
Affiliation:
London School of Hygiene and Tropical Medicine
C. James
Affiliation:
London School of Hygiene and Tropical Medicine
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Extract

It is apparent that under the conditions of the observations recorded in this study the host-parasite relationships of the two species of snails and their respective strains of S. haematobium exhibit marked similarity in certain respects but differ in others. Higher cercarial infection rates were obtained in B. globosus than in B. truncalus at relatively low miracidial exposure levels but the daily mean cercarial outputs of each species at the same miracidial exposure level were similar. A higher frequency of production of large numbers of cercariae was recorded for infividual B. globosus than for B. truncatus. The mean cercarial prepatent periods for B. globosus and B. truncatus at a level of 7 miracidia were each 32 days, but infected B. globosus lived appreciably longer than infected B. truncatus. The hourly output of both species exposed to stimuli for the same period of time was broadly similar. Peaks of cercarial production were generally reached earlier by individual B. truncatus (2 weeks) after onset of shedding than by individual B. globosus (4–5 weeks), although erratic shedding was observed for both species.

Type
Research Article
Information
Journal of Helminthology , Volume 46 , Issue 2 , June 1972 , pp. 185 - 199
Copyright
Copyright © Cambridge University Press 1972

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References

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