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

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 degrees 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.

[1]  P. Vignoles,et al.  Paramphistomum daubneyi: production dynamics and infectivity of metacercariae originating from snails dissected at regular intervals , 2008, Journal of Helminthology.

[2]  P. Vignoles,et al.  Optimization of metacercarial production for three digenean species by the use of petri dishes for raising lettuce-fed Galbatruncatula , 2007, Parasitology Research.

[3]  D. Rondelaud,et al.  Fasciola hepatica L.: etude de la productivité d'un sporocyste en fonction de la taille de Lymnaea truncatula Müller , 2004, Parasitology Research.

[4]  A. Mekroud,et al.  Variability in the prevalence of infection and cercarial production in Galba truncatula raised on a high-quality diet , 2004, Parasitology Research.

[5]  P. Vignoles,et al.  Larval development of Fasciola hepatica in experimental infections: variations with populations of Lymnaea truncatula , 2002, Journal of Helminthology.

[6]  D. Augot,et al.  Cercarial productivity of Fasciola hepatica in Lymnaea truncatula during usual and unusual development of redial generations , 2001, Parasitology Research.

[7]  C. G. Lee,et al.  Metacercarial production of Lymnaea viridis experimentally infected with Fasciola hepatica. , 1995, Veterinary parasitology.

[8]  D. Rondelaud,et al.  Fasciola hepatica L. : les caractéristiques de la charge parasitaire chez des Limnées tronquées mortes après une émission cercarienne , 1994 .

[9]  C. Ollerenshaw.  Some observations on the epidemiology of fascioliasis in relation to the timing of molluscicide applications in the control of the disease , 1971, Veterinary Record.

[10]  C. Ollerenshaw,et al.  The effect of nutrition on the growth of Fasciola hepatica in its snail host , 1963, Proceedings of the Nutrition Society.

[11]  S. Kendall,et al.  Nutritional Factors affecting the Rate of Development of Fasciola hepatica in Limnaea truncatula , 1949, Journal of Helminthology.