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    Dar, Yasser Vignoles, Philippe Rondelaud, Daniel and Dreyfuss, Gilles 2014. Radix natalensis: the effect ofFasciola hepaticainfection on the reproductive activity of the snail. Parasite, Vol. 21, p. 24.


The development of rediae of Fasciola hepatica in Radix natalensis subjected twice to bimiracidial exposures

  • Y. Dar (a1) (a2), P. Vignoles (a2), G. Dreyfuss (a2) and D. Rondelaud (a2)
  • DOI:
  • Published online: 08 September 2010

Experimental infections of Egyptian Radix natalensis with a French isolate of Fasciola hepatica (each snail was subjected twice to a bimiracidial exposure) were carried out to determine how many sporocysts grew in these snails and to study the developmental patterns of redial generations. Single-sporocyst infections were found in 69.3% (34/49) of infected snails, with equivalent numbers of normal and abnormal patterns. Snails with two- and three-sporocyst infections were 24.4% and 6.1%, respectively. In single- and two-sporocyst infections at days 42 and 56 post-exposure, the total redial burden was significantly higher in snails with a normal redial development. In two- and three-sporocyst infections, the overall maturity of rediae was delayed at days 42 and 56. The high frequency of abnormal patterns in R. natalensis (53.1% of all infected snails showed degeneration of a first mother redia) might be due to incomplete adaptation between the snail population and the parasite. The delayed redial maturity in two- and three-sporocyst infections can mainly be explained by the volume of the snail body, which would be insufficient to allow the simultaneous differentiation of most rediae over time.

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J.C. Boray (1978) The potential impact of exotic Lymnaea spp. on fascioliasis in Australasia. Veterinary Parasitology 4, 127141.

Y. Dar , F.F. Djuikwo Teukeng , P. Vignoles , G. Dreyfuss & D. Rondelaud (2010) Radix natalensis (Gastropoda: Lymnaeidae), a potential intermediate host of Fasciola hepatica in Egypt. Parasite (in press).

C.B. Ollerenshaw (1971) Some observations on the epidemiology of fascioliasis in relation to the timing of molluscicide applications in the control of the disease. The Veterinary Record 88, 152164.

M.V. Periago , M.A. Valero , M. El Sayed , K. Ashrafi , A. El Wakeel , M.Y. Mohamed , M. Desquesnes , F. Curtale & S. Mas-Coma (2008) First phenotypic description of Fasciola hepatica/Fasciola gigantica intermediate forms from the human endemic area of the Nile Delta, Egypt. Infection, Genetics and Evolution 8, 5158.

D. Rondelaud , P. Vignoles & G. Dreyfuss (2004) Fasciola hepatica: the developmental patterns of redial generations in naturally-infected Galba truncatula. Parasitology Research 94, 183187.

D. Rondelaud , M. Fousi , P. Vignoles , M. Moncef & G. Dreyfuss (2007) Optimization of metacercarial production for three digenean species by the use of Petri dishes for raising lettuce-fed Galba truncatula. Parasitology Research 100, 861865.

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Journal of Helminthology
  • ISSN: 0022-149X
  • EISSN: 1475-2697
  • URL: /core/journals/journal-of-helminthology
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