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Effect of concurrent infection with Muellerius capillaris on the development of redial generations of Fasciola hepatica in Lymnaea truncatula

Published online by Cambridge University Press:  05 June 2009

P. Hourdin
Affiliation:
Faculté de Médecine, Laboratoire d'Histologie, Unité d'Histopathologie Parasitaire, 2, Rue du Docteur Raymond Marcland, 87025 Limoges cédex, France
D. Rondelaud
Affiliation:
Faculté de Médecine, Laboratoire d'Histologie, Unité d'Histopathologie Parasitaire, 2, Rue du Docteur Raymond Marcland, 87025 Limoges cédex, France
J. Cabaret
Affiliation:
Institut National de la Recherche Agronomique, Station de Pathologie Aviaire et de Parasitologie, Unité d'Ecologie des Parasites, 37380 Nouzilly cédex, France

Abstract

The rediae of Fasciola hepatica were counted according to generation in adult and juvenile Lymnaea truncatula following single infection with Fasciola hepatica, double infection with F. hepatica and then Muellerius capillaris, or double infection with M. capillaris and F. hepatica. The rediae found in double infections were essentially first generation and an early cohort from the second generation. The following differences were observed in adult snails which underwent double infection when compared to corresponding single infections: i) dependent rediae were almost completely absent; ii) degenerating independent rediae were found in identical or decreased numbers; iii) living independent rediae of the first generation were decreased in number, while those of the second generation had variable decreased numbers. The results were similar in juvenile snails with double infections, except that the numbers of degenerating independent rediae were higher than those found in corresponding single infections and the numbers of rediae of the second generation were increased. The order of exposure in double infections had no influence on the number and maturation of fasciolid rediae.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1992

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