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Influence of shell size of Lymnaea columella on infectivity and development of Fasciola hepatica

Published online by Cambridge University Press:  01 March 2008

L.H.L. Coelho ,
M.P. Guimarães  and
W.S. Lima
L.H.L. Coelho
Affiliation:
Departamento de Parasitologia, Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Caixa Postal 486, Belo Horizonte, CEP 31270-901, Minas Gerais, Brazil
M.P. Guimarães
Affiliation:
Departamento de Parasitologia, Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Caixa Postal 486, Belo Horizonte, CEP 31270-901, Minas Gerais, Brazil
W.S. Lima*
Affiliation:
Departamento de Parasitologia, Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Caixa Postal 486, Belo Horizonte, CEP 31270-901, Minas Gerais, Brazil
*
*Author for correspondence Fax: +31 3499 2970 E-mail: [email protected]
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Abstract

Experimental infections of Lymnaea columella with Fasciola hepatica were carried out to determine the influence of shell size on the infection rate and on the outcome of rediae and cercariae. Snails were divided into seven groups according to shell size: 2–4 mm, 5–6 mm, 7–8 mm, 9–10 mm, 11–12 mm, 13–14 mm and 15 mm or more. One hundred snails in each group were infected by using four miracidia for each snail. Snails with larger shell size showed a lower infection rate, the groups presenting the highest (79%) and lowest (2%) proportions of positives being those of 5–6 mm and 15 mm or more, respectively. Cercariae were present in 21% of them at 31 days post-infection, and cercarial shedding was observed 61 days post-infection. It was concluded that there is a non-linear negative association between shell size and infection rate.

Type
Research Papers
Information
Journal of Helminthology , Volume 82 , Issue 1 , March 2008 , pp. 77 - 80
Copyright
Copyright © Cambridge University Press 2008

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