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An experimental study of the effects of Nosema eurytremae (Microsporida: Nosematidae) on the liver fluke Fasciola hepatica

Published online by Cambridge University Press:  06 April 2009

Elizabeth U. Canning ,
G. C. Higby  and
J. P. Nicholas
Elizabeth U. Canning
Affiliation:
Department of Zoology and Applied Entomology, Imperial College, London
G. C. Higby
Affiliation:
Department of Zoology and Applied Entomology, Imperial College, London
J. P. Nicholas
Affiliation:
Department of Zoology and Applied Entomology, Imperial College, London
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Summary

A microsporidian parasite, Nosema eurytremae, was fed to Lymnaea trunculata infected with Fasciola hepatica. Microsporidian infection of the snail was always light, though spores were present in all tissues, but the rediae became heavily infected in the parenchyma. The proportion of infected rediae increased with time and was especially high in ageing infections. Although rediae were only lightly infected when examined before cercarial release began, the infections became progressively heavier, so that towards the end of the life of the snails a high proportion of rediae were totally destroyed and contained no cercariae. Cercarial output was significantly depressed over a long period of active shedding by snails which had been hyperinfected with 1 × 10 6 spores and some of the liberated cercariae were themselves infected.

Type
Research Article
Information
Parasitology , Volume 79 , Issue 3 , December 1979 , pp. 381 - 392
Copyright
Copyright © Cambridge University Press 1979

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