Fasciola hepatica: variations in redial development and cercarial production in relation to the geographic origin of the parasite

Parasite

and Jorge Romero¹  Gilles Dreyfuss²  Philippe Vignoles²  Rodrigo Sanabria¹  Daniel Rondelaud² 

[1] CEDIVE, Fac. Cs. Veterinarias, Universidad Nacional de La Plata,Alvear 803,7130Chascoműs, Buenos Aires,Argentina;INSERM U 1094, Faculties of Medicine and Pharmacy,87025 Limoges,France

关键词: Redia;    Miracidium;    Galba truncatula;    France;    Fasciola hepatica;    Cercaria;    Argentina;   

Others  :  808504
DOI  :  doi:10.1051/parasite/2013034

 received in 2013-03-14, accepted in 2013-09-11,  发布年份 2013

【 摘 要 】

Two hundred Galba truncatula, originating from a French population, were subjected to single-miracidium infections with an allopatric isolate (origin, Argentina) of Fasciola hepatica. The control group was constituted by 100 snails coming from the same population and exposed to sympatric miracidia of F. hepatica according to the same protocol. Snail samples were collected bimonthly from both groups between day 14 and day 112 p.e. (at 20 °C) and snail dissections were performed to count free rediae, intraredial morulae and free cercariae. Third and fourth generation rediae were significantly more numerous in the allopatric group, while the number of first generation rediae was significantly lower. In the sympatric group, the decrease in the number of intraredial morulae in the first, second and third redial generations was significantly faster. Free cercariae within the snail body were significantly more numerous in the sympatric than in the allopatric groups, whatever the date of snail dissection. The changes in redial development and cercarial production noted in the Argentinean group might be due to the evolution of South American flukes in a divergent way after the introduction of foreign infected ruminants in this continent from the 15th century.

【 授权许可】

   
© D. Rondelaud et al., published by EDP Sciences, 2013

【 图 表 】

Figure 1.

Figure 2.

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