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Fasciola gigantica: larval productivity of three different miracidial isolates in the snail Lymnaea truncatula

Published online by Cambridge University Press:  12 April 2024

Y. Dar ,
P. Vignoles ,
D. Rondelaud  and
G. Dreyfuss
Y. Dar
Affiliation:
Department of Zoology, Faculty of Science, University of Tanta, Egypt: UPRES-EA no. 3174, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges Cedex, France
P. Vignoles
Affiliation:
UPRES-EA no. 3174, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges Cedex, France
D. Rondelaud*
Affiliation:
UPRES-EA no. 3174, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges Cedex, France
G. Dreyfuss
Affiliation:
UPRES-EA no. 3174, Faculties of Medicine and Pharmacy, University of Limoges, 87025 Limoges Cedex, France
*
*Author for correspondence Fax: 33 5 55 43 58 93 Email: [email protected]
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Abstract

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Bimiracidial infections of Lymnaea truncatula with three isolates of Fasciola gigantica, originating from China, Egypt and Madagascar, were carried out to determine the effect of geographic origin of the parasite on the larval productivity of redial generations. The prevalences of experimental infections in snails exposed to strains from Madagascar, China and Egypt were 20.8%, 60.0% and 80.0%, respectively. At day 49 post-exposure (p.e.), the total number of free rediae in snails infected with the Egyptian isolate was significantly higher than that recorded in the Madagascan group. On the other hand, at day 49 p.e., the majority of cercariae in the Chinese and Egyptian groups were produced by R2a rediae (70.6% and 66.6% of cercariae produced by all live rediae), while, in the Madagascan group, the cercariae were produced mainly by the first redial generation. Snails infected with the Egyptian isolate of miracidia developed more live rediae and, consequently, could produce a higher number of cercariae. As a result, L. truncatula snails were highly adapted to infections with the Egyptian and Chinese isolates of F. gigantica.

Type
Review Article
Information
Journal of Helminthology , Volume 77 , Issue 1 , March 2003 , pp. 11 - 14
Copyright
Copyright © Cambridge University Press 2003

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