Abstract
Allopatric infections of French Galba truncatula with an Argentinean isolate of Fasciola hepatica were carried out to determine the infectivity of foreign miracidia in three snail populations differing by their susceptibility to French miracidia (two highly and one poorly susceptible populations). Sympatric infections of G. truncatula with French miracidia were used as controls. Compared to sympatric infections of G. truncatula, snail survival at day 30 post-infection in allopatric groups was significantly lower in a highly susceptible population and significantly greater in the other two. Prevalence in snails infected with the allopatric isolate was significantly lower (16.4–34.5 % instead of 58.6–72.1 %), whereas their patent period was significantly longer (a mean of 69.9–85.9 days instead of 6.4–20.7 days). The mean number of metacercariae was also higher in allopatric groups (236.5–897.3 per cercariae-shedding snail instead of 70.7–222.1). Owing to longer patent periods, the Argentinean isolate of F. hepatica was less pathogenic for these snails. The lower prevalence of infection, the longer patent period and the higher number of metacercariae noted in allopatric groups might be the consequence of an adaptive mechanism used by this digenean introduced to the New World to infect new populations of unusual intermediate hosts.
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Sanabria, R., Mouzet, R., Courtioux, B. et al. Comparative strategies and success of sympatric and allopatric Fasciola hepatica infecting Galba truncatula of different susceptibilities. Parasitol Res 112, 2255–2259 (2013). https://doi.org/10.1007/s00436-013-3385-4
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DOI: https://doi.org/10.1007/s00436-013-3385-4