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Encystment and excystment of the paramphistomid trematode Zygocotyle lunata

Published online by Cambridge University Press:  24 September 2010

K.E. LeSage  and
B. Fried
K.E. LeSage
Affiliation:
Department of Biology, Lafayette College, Easton, PA18042, USA
B. Fried*
Affiliation:
Department of Biology, Lafayette College, Easton, PA18042, USA
*
*E-mail: [email protected]
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Abstract

This study reports further observations on encystment and excystment of the paramphistomid trematode Zygocotyle lunata. Of numerous substrates tested in the laboratory for cercarial encystment, i.e. plastic and glass dishes, Styrofoam™, aluminium foil, snail shells, and cheesecloth, all but cheesecloth allowed for 100% encystment within 4 h of cercarial release at 28°C. Numerous physical and chemical factors were tested to kill cysts, and their capacity to do so was determined by the subsequent inability of cysts to excyst within a chemical excystment medium. Vinegar, Italian salad dressing, soy sauce and 10% solutions of sucrose, acetic acid and sodium chloride were the most detrimental. Freezing, boiling and storage of cysts for more than 2 years also killed them. Several marinades such as lemon juice, Worcestershire sauce, and various concentrations of potassium permanganate, did not kill the majority of cysts tested. Since Z. lunata is a potential foodborne trematode for humans and animals, it is important to determine suitable ways to control or kill these cysts.

Type
Research Papers
Information
Journal of Helminthology , Volume 85 , Issue 3 , September 2011 , pp. 300 - 303
Copyright
Copyright © Cambridge University Press 2010

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