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Prevalence and intensity of infections in the lymnaeid snail Omphiscola glabra experimentally infected with Fasciola hepatica, Fascioloides magna and Paramphistomum daubneyi

Published online by Cambridge University Press:  01 March 2007

G. Dreyfuss
Affiliation:
UPRES EA 3174/USC INRA, Faculty of Pharmacy and Faculty of Medicine, University of Limoges, 87025 Limoges, France:
A. Novobilský
Affiliation:
University of Veterinary and Pharmaceutical Sciences, Palackého 1-3, 612 42 Brno, Czech Republic:
P. Vignoles
Affiliation:
UPRES EA 3174/USC INRA, Faculty of Pharmacy and Faculty of Medicine, University of Limoges, 87025 Limoges, France:
V. Bellet
Affiliation:
UPRES EA 3174/USC INRA, Faculty of Pharmacy and Faculty of Medicine, University of Limoges, 87025 Limoges, France:
B. Koudela
Affiliation:
University of Veterinary and Pharmaceutical Sciences, Palackého 1-3, 612 42 Brno, Czech Republic: Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budĕjovice, Czech Republic
D. Rondelaud*
Affiliation:
UPRES EA 3174/USC INRA, Faculty of Pharmacy and Faculty of Medicine, University of Limoges, 87025 Limoges, France:
*
*Author for correspondence Fax: 33-555-435893 E-mail: daniel.rondelaud@unilim.fr

Abstract

Single and double infections of juvenile Omphiscola glabra (Gastropoda: Lymnaeidae) with Paramphistomum daubneyi and/or Fasciola hepatica were carried out to determine the redial burden and cercarial production in snails dissected at day 60 or at day 75 post-exposure (p.e.) in the laboratory at 20°C. The results were compared with those obtained with single-miracidium infections by Fascioloides magna. Compared to F. hepatica, low values were noted at day 75 p.e. for the prevalence of snail infections with P. daubneyi (4.6–8.3% instead of 23.6–25.9%), the total number of free rediae (10.7–17.9 per snail instead of 26.3–34.7), and that of free cercariae (112.8–136.9 per snail instead of 177.8–248.5). Despite a greater number of free rediae at day 75 p.e. (36.2–45.6 per snail), the prevalences of snail infections with F. magna and cercarial production were similar to those noted for F. hepatica. The results concerning F. hepatica and P. daubneyi might partly be explained by a progressive adaptation of O. glabra to sustain the larval development of these digeneans over the years, as this snail is a natural intermediate host of F. hepatica and P. daubneyi in central France since 1995. Compared with the high number of fully-grown rediae of F. magna in O. glabra, cercarial production seemed limited and this might be explained by the presence of high numbers of rediae which reduced the avaibility of nutrients for cercarial differentiation within the snail.

Type
Research Papers
Copyright
Copyright © 2007 Cambridge University Press 2007

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