<i>Fasciola hepatica</i>: the infection rate and the development of redial generations in <i>Lymnaea truncatula</i> exposed to miracidia after experimental desiccation and activation in water

Rondelaud, D.

doi:10.1017/s0022149x00013493

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…Large mother redia packed with developing daughter rediae. Similar observations of asynchronous development of rediae by the related fasciolid parasites (Rakondravao et al, 1992;Rondelaud, 1994) are also suggestive of a degree of specialization. Scale bar = 200llm.…”

Section: Echinostome Life Cyclesupporting

confidence: 62%

Echinostomes as Experimental Models for Biological Research

Fried¹,

Graczyk²

2000

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Section: Echinostome Life Cyclesupporting

confidence: 62%

Echinostomes as Experimental Models for Biological Research

Fried¹,

Graczyk²

2000

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“…However, for some factors, variations in the numbers of free and live rediae were noted. Drought of the snail habitat for 35 days (Rondelaud, 1994), as well as seven biotic factors, have the effect of limiting redial numbers in the three generations. Among the biotic factors, the most important are the species of the definitive host from which eggs of F. hepatica are collected for snail infections (miracidia originating from eggs collected from cattle, sheep or nutria had a greater infectivity than those coming from lagomorphs: Rondelaud & Dreyfuss, 1995; Vignoles et al , 2004), the susceptibility or the resistance of adult flukes to triclabendazole (Walker et al , 2006), and the frequency of encounters between snails and the parasite in the field (Rondelaud, 1993).…”

Section: Resultsmentioning

confidence: 99%

Redial generations ofFasciola hepatica: a review

Rondelaud¹,

Belfaiza

Vignoles³

et al. 2009

J. Helminthol.

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An update on the redial generations of Fasciola hepatica was carried out to highlight the different developmental patterns of rediae, the effects of some factors on these generations, and the consequences of such developmental patterns on cercarial productivity. The development of generations is dependent on the behaviour of the first mother redia of the first generation. If this redia remains alive throughout snail infection, it produces most second-generation rediae. In contrast, if it dies during the first weeks, daughter redia formation is ensured by a substitute redia (the second mother redia of the first generation, or the first redia of the second generation). Environmental and biotic factors do not modify the succession of redial generations, but most act by limiting the numbers of rediae, either in all generations, or in the second and/or third generations. An abnormal development of rediae reduces the number of cercariae and most are formed by the second cohort of the first generation. By contrast, most cercariae are produced by the first cohort of the second generation when redial development is normal. The mother rediae described by previous authors might correspond to the first generation and the second cohort of the second generation, while daughter rediae would be the second cohort of the second generation and the first cohort of the third generation. Under certain circumstances, daughter redia formation is ensured by the first two mother rediae or all first-generation rediae, thus demonstrating that the first mother redia is not the only larva to ensure daughter redia formation.

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“…truncatula did not support easily the effects of aestivation (Rondelaud and Morel-Vareille, 1975;Rondelaud, 1994) and, under such conditions, other potential vectors could play an important role in parasite transmission. In Belgium where the three species are present the respective role of each of them remained to be determined although G. truncatula is the main intermediate host.…”

Section: Discussionmentioning

confidence: 83%

Fasciola hepatica: An assessment on the vectorial capacity of Radix labiata and R. balthica commonly found in Belgium

Caron¹,

Lasri²,

Losson³

2007

Veterinary Parasitology

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A previous study conducted in Belgium revealed that genetic material of Fasciola sp. was present in snail species belonging to the genus Radix. Here, these snails were collected and identified by DNA-based techniques as Radix labiata and Radix balthica. These two species and Galba truncatula (the major intermediate host in Europe) were experimentally infected with Fasciola hepatica. The resulting metacercariae were fed to rats and the infection was monitored using several techniques. Microscopy revealed the presence of larval stages in 78.3, 45, and 6.25% of G. truncatula, R. labiata, and R. balthica snails, respectively. These results were confirmed by a PCR that amplifies a Fasciola sp. specific sequence. Furthermore, this PCR was found to be more sensitive than microscopic examination. R. labiata shed fewer metacercariae than G. truncatula but these were as infective to rats as those shed by G. truncatula. This study demonstrates that R. labiata may act as an incidental intermediate host for F. hepatica in Belgium. #

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Fasciola hepatica: the infection rate and the development of redial generations in Lymnaea truncatula exposed to miracidia after experimental desiccation and activation in water

Cited by 10 publications

References 17 publications

Echinostomes as Experimental Models for Biological Research

Echinostomes as Experimental Models for Biological Research

Redial generations ofFasciola hepatica: a review

Fasciola hepatica: An assessment on the vectorial capacity of Radix labiata and R. balthica commonly found in Belgium

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