CEDIVE, Universidad Nacional de La Plata, Chascomús, Buenos Aires, Argentina.
Parasite. 2012 Nov;19(4):445-9. doi: 10.1051/parasite/2012194445.
Experimental infections of two South American lymnaeids (Lymnaea neotropica and L. viatrix var. ventricosa) with Paramphistomum daubneyi were carried out to determine if these snail species could sustain larval development of this digenean and, if so, to specify their potential for cercarial production. A French population of Galba truncatula infected and raised according to the same protocol served as controls. In both experiments, prevalence of P. daubneyi infections in snails did not significantly differ from each other. In snail groups evaluated for cercarial shedding (first experiment), a significantly lower number of shed cercariae was noted for L. neotropica, while those from G. truncatula and L. v. ventricosa did not differ significantly from each other. Dissection of infected snails at day 65 post-exposure at 20°C (second experiment) found significantly lower burdens of P. daubneyi rediae and cercariae in the bodies of L. neotropica than in those of G. truncatula and L. v. ventricosa. Compared to total cercarial production observed in dissected snails, the percentage of cercariae which exited from snails was 75.6% for G. truncatula, 21.6% for L. neotropica, and 91.4% for L. v. ventricosa. This last species seems to be a good candidate for metacercarial production of P. daubneyi.
南美圆田螺（Lymnaea neotropica 和 L. viatrix var. ventricosa）与双腔吸虫（Paramphistomum daubneyi）的实验感染，旨在确定这些螺类是否能支持该复殖吸虫的幼虫发育，如果可以，确定它们潜在的尾蚴产生能力。一个感染了巴氏副双腔吸虫（Paramphistomum daubneyi）并按照相同方案饲养的法国圆田螺（Galba truncatula）种群作为对照。在这两项实验中，螺类感染巴氏副双腔吸虫的流行率彼此之间没有显著差异。在评估尾蚴脱落的螺类群体（第一项实验）中，明显注意到，与 G. truncatula 和 L. v. ventricosa 相比，L. neotropica 脱落的尾蚴数量显著减少。在 20°C 下暴露后第 65 天进行的受感染螺类解剖（第二项实验）发现，L. neotropica 体内巴氏副双腔吸虫的裂体生殖和尾蚴负荷明显低于 G. truncatula 和 L. v. ventricosa。与解剖螺类中观察到的总尾蚴产量相比，从螺类中逸出的尾蚴百分比为 G. truncatula 为 75.6%，L. neotropica 为 21.6%，L. v. ventricosa 为 91.4%。最后一个物种似乎是巴氏副双腔吸虫的间尾蚴产生的良好候选者。
