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Total cercarial output in two populations of Galba truncatula experimentally infected with Fasciola hepatica

Published online by Cambridge University Press:  22 July 2009

P. Vignoles ,
F. Aimeur ,
A. Titi ,
D. Rondelaud ,
A. Mekroud  and
G. Dreyfuss
P. Vignoles
Affiliation:
UPRES EA no. 3174, Faculties of Pharmacy and Medicine, 87025Limoges Cedex, France
F. Aimeur
Affiliation:
Department of Veterinary Science, Faculty of Science, University of Constantine, 25000Constantine, Algeria
A. Titi
Affiliation:
Department of Veterinary Science, Faculty of Science, University of Constantine, 25000Constantine, Algeria
D. Rondelaud
Affiliation:
UPRES EA no. 3174, Faculties of Pharmacy and Medicine, 87025Limoges Cedex, France
A. Mekroud
Affiliation:
Department of Veterinary Science, Faculty of Science, University of Constantine, 25000Constantine, Algeria
G. Dreyfuss*
Affiliation:
UPRES EA no. 3174, Faculties of Pharmacy and Medicine, 87025Limoges Cedex, France
*
*Fax: +33 555 435863 E-mail: [email protected]
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Abstract

Experimental infections of pre-adult Galba truncatula (two populations) using one, two, three or five miracidia of Fasciola hepatica per snail were carried out to determine the total number of cercariae produced by snails when they were sacrificed at day 70 post-exposure (at 24°C). When the number of miracidia used for each snail increased at exposure, significant numerical augmentations of live rediae and of intraredial differentiating cercariae were noted. In contrast, only insignificant differences between mean numbers of free cercariae were found. The number of metacercariae produced by each snail (after shedding and/or after dissection) increased in infections with up to three miracidia per snail in each population and strongly decreased in infections with five miracidia per snail. Compared to the other types of infections, the delay of cercarial differentiation noted in the five-miracidia groups was probably due to the volume of the snail host, which would be too small to assure the complete development of five sporocysts.

Type
Research Papers
Information
Journal of Helminthology , Volume 84 , Issue 1 , March 2010 , pp. 77 - 80
Copyright
Copyright © Cambridge University Press 2009

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