title: Pseudosuccinea columella: age resistance to Calicophoron daubneyi infection in two snail populations.
abstract: Individual infections of Egyptian and French Pseudosuccinea columella with five miracidia of Calicophoron daubneyi were carried out to determine whether this lymnaeid was capable of sustaining larval development of this parasite. On day 42 post-exposure (at 23 °C), infected snails were only noted in groups of individuals measuring 1 or 2 mm in height at miracidial exposure. Snail survival in the 2-mm groups was significantly higher than that noted in the 1-mm snails, whatever the geographic origin of snail population. In contrast, prevalence of C. daubneyi infection was significantly greater in the 1-mm groups (15-20% versus 3.4-4.0% in the 2-mm snails). Low values were noted for the mean shell growth of infected snails at their death (3.1-4.0 mm) and the mean number of cercariae (<9 in the 1-mm groups, <19 in the 2-mm snails). No significant differences between snail populations and snails groups were noted for these last two parameters. Most infected snails died after a single cercarial shedding wave. Both populations of P. columella showed an age resistance to C. daubneyi infection and only juveniles measuring 2 mm or less in shell height at exposure can ensure larval development of this digenean up to cercarial shedding.
authors: Department of Zoology, Faculty of Science, University of Tanta, Tanta, Egypt - INSERM 1094, Faculties of Medicine and Pharmacy, 87025 Limoges, France.
authors: Yasser
authors: Y
authors: Dar
authors: INSERM 1094, Faculties of Medicine and Pharmacy, 87025 Limoges, France.
authors: Daniel
authors: D
authors: Rondelaud
authors: INSERM 1094, Faculties of Medicine and Pharmacy, 87025 Limoges, France.
authors: Philippe
authors: P
authors: Vignoles
authors: INSERM 1094, Faculties of Medicine and Pharmacy, 87025 Limoges, France.
authors: Gilles
authors: G
authors: Dreyfuss
mesh_terms: D000367:Age Factors; D060105:Animal Shells / Q000254:growth & development; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology; D058487:Cercaria; D004199:Disease Vectors; D004534:Egypt; D005602:France; D058507:Host Specificity; D006790:Host-Parasite Interactions; D010250:Paramphistomatidae / Q000254:growth & development / Q000302:isolation & purification* / Q000502:physiology; D012417:Rumen / Q000469:parasitology; D012908:Snails / Q000469:parasitology*; D013045:Species Specificity; D013272:Stomach Diseases / Q000469:parasitology / Q000662:veterinary; D014201:Trematode Infections / Q000469:parasitology / Q000662:veterinary