Comparative studies on the productivity ofFasciola gigantica andF. hepatica sporocysts inLymnaea tomentosa that died after a cercarial shedding or without emission (original) (raw)

Abstract

A histology study was performed on_Fasciola gigantica_- or_F. hepatica_-infected_Lymnaea tomentosa_ that died after a cercarial shedding or without emission to compare the parasite productivity of each trematode. Degenerated rediae increased in number throughout the experiment. Their number rose rapidly after day 79 in snails that died after shedding in the_F. gigantica_ group; they increased more slowly in snails that died without shedding. In the_F. hepatica_ group the number rose after day 63 in the former snails and after day 79 in the latter. The contents of normal rediae evolved inversely. The number of morulae, for example, dropped rapidly after day 79 in the_F. gigantica_ group. In the_F. hepatica_ group it dropped after day 63 in snails that died after shedding and decreased after day 79 in the other dead snails. Free and degenerated cercariae were more numerous in snails that died without emission than in those that died at shedding. They rapidly increased in number after day 77. The numbers of rediae of_F. gigantica_ were substantially greater than those of_F. hepatica_. In each group considered separately, it was likewise higher in snails that died without shedding than in those that died after the shedding of cercariae.

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Authors and Affiliations

1. Laboratoire de Parasitologie, Faculté de Pharmacie, 2, rue du Docteur Raymond Marcland, F-87025, Limoges Cedex, France
   G. Dreyfuss
2. Laboratoire d'Histopathologie Parasitaire, Faculté de Médecine, 2, rue du Docteur Raymond Marcland, F-87025, Limoges Cedex, France
   D. Rondelaud

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1. G. Dreyfuss
2. D. Rondelaud

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Dreyfuss, G., Rondelaud, D. Comparative studies on the productivity of_Fasciola gigantica_ and_F. hepatica_ sporocysts in_Lymnaea tomentosa_ that died after a cercarial shedding or without emission.Parasitol Res 81, 531–536 (1995). https://doi.org/10.1007/BF00931798

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• Received: 20 September 1994
• Accepted: 17 January 1995
• Issue date: June 1995
• DOI: https://doi.org/10.1007/BF00931798

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