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  • Title: Total cercarial output in two populations of Galba truncatula experimentally infected with Fasciola hepatica.
    Author: Vignoles P, Aimeur F, Titi A, Rondelaud D, Mekroud A, Dreyfuss G.
    Journal: J Helminthol; 2010 Mar; 84(1):77-80. PubMed ID: 19622196.
    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 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.
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