Paramphistomum daubneyi: the number of sporocysts developing in experimentally and naturally infected Galba truncatula

Abstract

Experimental infections of Galba truncatula with Paramphistomum daubneyi were carried out to determine at day 50 (at 24 degrees C) the numbers of sporocysts, which grew in infected snails via the count of first- and second-generation rediae. In snails individually exposed to one, two, three, four, or five miracidia, the numbers of first-generation rediae increased from the one-miracidium group to the five-miracidium snails (from a mean of 6.7 to 26.1), while second-generation rediae decreased in number (from 6.2 to 0.9, respectively). This scale of redial numbers was used to determine the number of sporocysts, which grew in naturally infected snails collected from sedimentary or acid soils between 1993 and 2006. In cercariae-containing snails, natural infections resulting from the development of one to five sporocysts were found in both samples of G. truncatula examined. The numbers of 3-, 4-, and 5-sporocyst infections were increasing over time since 1997, 2000, and 2003, respectively. The utility of such multiple-sporocyst infections is open to question, as the differentiation of second-generation rediae and that of procercariae were delayed and always limited. They might be interpreted as a consequence of a zoonosis, which has been spreading since 1990 in ruminants of central France.

The prevalence and development of digenean parasites within their intermediate snail host, Galba truncatula , in a geographic area where the presence of Calicophoron daubneyi has recently been confirmed

“…Furthermore, free redial burdens within individual infected snails had also increased over the same period, with levels rising to become similar to consistently observed F. hepatica redial burdens in the same populations by the final year of the study (Mage et al, 2002). Similar findings have also been observed in two other regions of France regarding C. daubneyi prevalence and its infection intensity in G. truncatula snails, with the number of G. truncatula snails found harbouring three or four sporocyst progressively increasing during a twelve year period from 1994 (Dreyfuss et al, 2008). …”

Prevalence of mixed trematode infections in an abattoir receiving cattle from northern Portugal and north‐west Spain

“…INFECTION of ruminants by the liver trematode parasite Fasciola hepatica is distributed worldwide, especially in areas under oceanic climate conditions (Arias and others 2009), where the presence of elevated humidity, frequent rainfall and mild temperatures provides a suitable environment for the development of its intermediate host, Galba truncatula (Rondelaud and others 2001, Phiri and others 2005). As Calicophoron daubneyi (Digenea: Paramphistomidae) (Dinnik 1962, Eduardo 1983) and F hepatica use the same lymnaeid ( G truncatula ) in their life cycle, the presence of mixed infections by liver and ruminant flukes has been reported both in the lymnaids and in the cattle (Abrous and others 1999, Dreyfuss and others 2008).…”

The prevalence and infection rates of amphistome species in intermediate snail hosts: a systematic review and meta-analysis

“…This could also be attributed to the high endemicity of this amphistome species in Europe, where a higher prevalence of C. daubneyi was recorded in definitive hosts (34). Furthermore, C. daubneyi natural infections were detected in a number of snails, which included G. truncatula (35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46), L. ovata (38), O. glabra (35,36,46), and Ph. acuta (38) in Europe.…”