Unusual snail species involved in the transmission of Fasciola hepatica in watercress beds in central France.
Parasite
; 9(2): 113-20, 2002 Jun.
Article
em En
| MEDLINE
| ID: mdl-12116856
ABSTRACT
Four freshwater pulmonate species (Lymnaea ovata, L. stagnalis, Physa acuta, Planorbis leucostoma) were living in several watercress beds known for their relationships with human cases of fasciolosis, whereas L. truncatula was never found. The aims of these studies were to determine the prevalence of natural infections with Fasciola hepatica in snails and to verify if these species might ensure the full larval development of this trematode (with cercarial shedding) when they were experimentally subjected to F. hepatica only, or to co-infections with an other trematode species. Investigations were so carried out in six snail populations living in watercress beds (including three for P. acuta) and in four others originating from three brooks or a pond (as controls). Snails naturally infected with F. hepatica were found in two watercress beds inhabited by L. ovata (prevalence of infection 1.4%) and P. leucostoma (0.1%), respectively. The L. ovata from the watercress bed could be infected at a higher size than those from the control population and the prevalence of this infection was greater in the bed population. Similar findings were noted for L. stagnalis. Despite single or dual infections, the results obtained with the four populations of P. acuta were unsuccessful. In contrast, the co-infections of young P. leucostoma with Paramphistomum daubneyi and F. hepatica resulted in the shedding of some F. hepatica cercariae. According to the authors, the occurrence of fasciolosis in these watercress beds would be the consequence of frequent natural encounters between parasite and snails (L. ovata, L. stagnalis), or of co-infections with P. daubneyi and F. hepatica (P. leucostoma). In watercress beds only colonized by P. acuta, a lymnaeid species would have ensured the larval development of F. hepatica but it would have been eliminated by P. acuta, as this last species was known to be invasive and could colonize open drainage ditches on siliceous soil.
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Base de dados:
MEDLINE
Assunto principal:
Plantas Comestíveis
/
Caramujos
/
Reservatórios de Doenças
/
Vetores de Doenças
/
Fasciola hepatica
/
Fasciolíase
Tipo de estudo:
Risk_factors_studies
Limite:
Animals
/
Humans
País/Região como assunto:
Europa
Idioma:
En
Revista:
Parasite
Assunto da revista:
PARASITOLOGIA
Ano de publicação:
2002
Tipo de documento:
Article
País de afiliação:
França