Unusual Transmission of the Liver Fluke, Fasciola hepatica, by Lymnaea glabra or Planorbis leucostoma in France

Abrous, M.; Rondelaud, D.; Dreyfuss, G.; Cabaret, Jacques

doi:10.2307/3284683

Cited by 37 publications

(34 citation statements)

References 8 publications

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“…In contrast, the co-infection of this snail resulted in the shedding of some F. hepatica cercariae. These findings agreed with the data reported by Abrous et al (1998) for P. leucostoma when this snail was subjected to successive exposures using P. daubneyi and F. hepatica miracidia. The presence of some immature rediae of P. daubneyi in the P. leucostoma living in this watercress bed may explain the case of human fasciolosis and suggests that a snail co-infection with both trematodes had occurred when the metacercariae of F. hepatica were present on the watercress eaten by man.…”

Section: Experimental Infections Of Snailssupporting

confidence: 92%

Unusual snail species involved in the transmission ofFasciola hepaticain watercress beds in central France

Dreyfuss¹,

Vignoles²,

Abrous³

et al. 2002

Parasite

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Summary :Four freshwater pulmonate species (Lymnaea ovata, L. stagnalis, Physa acuta, Planorbis leucostoma) were living in several watercress beds known for their relationships with human cases of fasciolosis, whereas L. truncatula was never found. The aims of these studies were to determine the prevalence of natural infections with Fasciola hepatica in snails and to verify if these species might ensure the full larval development of this trematode (with cercarial shedding] when they were experimentally subjected to F. hepatica only, or to co-infections with an other trematode species. Investigations were so carried out in six snail populations living in watercress beds (including three for P. acuta) and in four others originating from three brooks or a pond (as controls). Snails naturally infected with F. hepatica were found in two watercress beds inhabited by L. ovata (prevalence of infection: 1.4 %) and P. leucostoma (0.1 %), respectively. The L. ovata from the watercress bed could be infected at a higher size than those from the control population and the prevalence of this infection was greater in the bed population. Similar findings were noted for L. stagnalis. Despite single or dual infections, the results obtained with the four populations of P. acuta were unsuccessful. In contrast, the co-infections of young P. leucostoma with Paramphistomum daubneyi and F. hepatica resulted in the shedding of some F. hepatica cercariae. According to the authors, the occurrence of fasciolosis in these watercress beds would be the consequence of frequent natural encounters between parasite and snails (L. ovata, L. stagnalis), or of co-infections with P. daubneyi and F. hepatica (P. leucostoma). In watercress beds only colonized by P. acuta, a lymnaeid species would have ensured the larval development of F. hepatica but it would have been eliminated by P. acuta, as this last species was known to be invasive and could colonize open drainage ditches on siliceous soil.

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Section: Experimental Infections Of Snailssupporting

confidence: 92%

Unusual snail species involved in the transmission ofFasciola hepaticain watercress beds in central France

Dreyfuss¹,

Vignoles²,

Abrous³

et al. 2002

Parasite

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“…These farms were chosen either randomly among a sample of 407 cattle-breeding farms [3] surveyed in these three departments, or following the detection of fasciolosis (since 1989) or paramphistomosis (since 1994) among cattle. Every year, the sampling of L. truncatula was carried out among a sample of 8 to 12 farms (out of 141).…”

Section: Investigations In Snailsmentioning

confidence: 99%

Fasciola hepatica and Paramphistomum daubneyi: changes in prevalences of natural infections in cattle and in Lymnaea truncatula from central France over the past 12 years

Mage

Bourgne²,

Toullieu³

et al. 2002

Vet. Res.

131

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-A retrospective study was carried out over a 10-to 12-year period to analyse the changes in prevalences of natural fasciolosis and paramphistomosis among cattle and snails in central France, and to determine the causes which had induced these changes. The prevalences of natural fasciolosis in cattle increased from 1990 to 1993 (13.6% to 25.2%) and diminished afterwards up to 1999 (at 12.6%). Those of natural paramphistomosis showed a progressive increase between 1990 and 1999 (from 5.2 to 44.7%). The prevalences of natural infections and the numbers of free rediae counted in the snails (Lymnaea truncatula) infected with F. hepatica did not show any significant variations over time. By contrast, the prevalences of natural paramphistomosis in snails significantly increased from 1989 to 1996 and remained afterwards in the same range of values (3.7-5.3%), while the number of free rediae significantly increased up to 2000 (from a mean of 6.5 to 13.8 rediae per infected snail, respectively). Three hypotheses may explain the increase of paramphistomosis in cattle and snails: a better quality of diagnosis for the detection of P. daubneyi eggs in veterinary analysis laboratories, the use of specific molecules in the treatment of cattle fasciolosis since 1993, and the lack of an effective treatment up to now against cattle paramphistomosis. Since the objective of most farmers in central France is to obtain the highest antiparasitic efficiency with a single treatment of cattle per year, it is reasonable to assume that the prevalence of bovine paramphistomosis will continue to increase in the future. Résumé -Fasciola hepatica et Paramphistomum daubneyi : changements dans les prévalences des infestations naturelles chez les bovins et chez Lymnaea truncatula dans le centre de la France au cours des 12 dernières années. Une étude rétrospective a été réalisée sur une période de 10 à 12 années pour analyser les modifications qui se sont produites dans les prévalences de la fasciolose et de la paramphistomose naturelles chez les bovins et les limnées du centre de la France, et pour déterminer les causes qui ont provoqué ces changements. Chez les bovins, la prévalence de la fasciolose naturelle s'est accrue entre 1990 et 1993 (de 13,6 à 25,2 %) avant de diminuer par la suite jusqu'en 1999 (à 12,6 %). Celle de la paramphistomose naturelle a augmenté de manière progressive entre 1990 et 1999 (de 5,2 à 44,7 %). La prévalence de l'infestation naturelle avec F. hepatica et le nombre de rédies libres chez Lymnaea truncatula n'ont pas montré de variations significatives dans le temps. Par contre, la prévalence de l'infestation naturelle avec Paramphistomum daubneyi chez les limnées a présenté une augmentation significative entre 1989 et 1996 avant de rester ensuite dans la même gamme de valeurs (3,7-5,3 %), tandis que le nombre de rédies libres a augmenté jusqu'en 2000 (de 6,5 à 13,8 rédies en moyenne par mollusque infesté). Trois hypothèses peuvent expliquer cet accroissement de la paramphistomose chez les bovins et les mollus...

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“…However, other lymnaeid species can also sustain larval development of F. hepatica. Among them, Lymnaea glabra ( ¼ Omphiscola glabra) was reported by our team to be a natural or experimental intermediate host of this digenean in central France (Abrous et al, 1996(Abrous et al, , 1998(Abrous et al, , 1999(Abrous et al, , 2000Dreyfuss et al, 2003Dreyfuss et al, , 2005Rondelaud, 2004). A literature review reveals two different modes of snail infection by F. hepatica.…”

Section: Introductionmentioning

confidence: 99%

Lymnaea glabra: progressive increase in susceptibility to Fasciola hepatica through successive generations of experimentally infected snails

et al. 2014

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Experimental infections of Lymnaea glabra (two populations) with Fasciola hepatica were carried out during seven successive snail generations, to determine if prevalence and intensity of snail infection increased over time through descendants of snails already infected with F. hepatica. Controls were descendants coming from uninfected parents and infected according to the same protocol. No larval forms were found in the bodies of control snails coming from uninfected parents. In contrast, prevalence and intensity of F. hepatica infection in snails originating from infected parents progressively increased from the F2 or F3 to the F6 generation of L. glabra. In another experiment carried out with the F7 generations of L. glabra and a single generation of Galba truncatula (as controls), the prevalence of F. hepatica infection and the total number of cercariae were lower in L. glabra (without significant differences between both populations). If the number of cercariae shed by infected snails was compared to overall cercarial production noted in snails containing cercariae but dying without emission, the percentage was greater in G. truncatula (69% instead of 52-54% in L. glabra). Even if most characteristics of F. hepatica infection were lower in L. glabra, prevalence and intensity of parasite infection increased with snail generation when tested snails came from infected parents. This mode of snail infection with F. hepatica suggests an explanation for cases of fasciolosis occurring in cattle-breeding farms where paramphistomosis is lacking and G. truncatula is absent.

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Unusual Transmission of the Liver Fluke, Fasciola hepatica, by Lymnaea glabra or Planorbis leucostoma in France

Cited by 37 publications

References 8 publications

Unusual snail species involved in the transmission ofFasciola hepaticain watercress beds in central France

Unusual snail species involved in the transmission ofFasciola hepaticain watercress beds in central France

Fasciola hepatica and Paramphistomum daubneyi: changes in prevalences of natural infections in cattle and in Lymnaea truncatula from central France over the past 12 years

Lymnaea glabra: progressive increase in susceptibility to Fasciola hepatica through successive generations of experimentally infected snails

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