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      Fasciola hepatica: characteristics of infection in Lymnaea truncatula in relation to the number of miracidia at exposure.

      1 , , ,

      Experimental parasitology

      Elsevier BV

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          Abstract

          Experimental infections of Lymnaea truncatula by Fasciola hepatica were carried out in three snail populations to determine whether the number of miracidia used for each snail at exposure (1, 2, 5, 10, or 20 per snail) had any influence on the characteristics of Fasciola infection and metacercarial production. The number of miracidia had a significant influence on snail survival at day 30 postexposure and the frequency of infected L. truncatula that died without shedding (NCS snails). The frequency of NCS snails, the growth of cercaria-shedding snails throughout the experiment, the time between exposure and the first cercarial shedding, the duration of shedding, and the number of metacercariae were independent of the number of miracidia used for each snail. The highest metacercaria productivity for each miracidium was found in single-miracidium infections. Single-miracidium infections were the most effective, as the mean number of cercariae was the same as in other groups, whereas their survival rate was much higher.

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          Author and article information

          Journal
          Exp. Parasitol.
          Experimental parasitology
          Elsevier BV
          0014-4894
          0014-4894
          May 1999
          : 92
          : 1
          Affiliations
          [1 ] Laboratoire de Parasitologie, Faculté de Pharmacie, Limoges, France.
          Article
          S0014-4894(99)94395-3
          10.1006/expr.1999.4395
          10329361

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