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Explaining premunition with Kin selection using Haemonchus contortus

Published online by Cambridge University Press:  05 April 2016

JENNIFER K. KETZIS*
Affiliation:
Ross University School of Veterinary Medicine, Basseterre, St. Kitts and Nevis, West Indies Formerly Department of Animal Science, Cornell University, Ithaca, New York 14853, USA
ELIZABETH A. FOGARTY
Affiliation:
Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York 14853, USA Formerly Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
KARYNA MARTTINI
Affiliation:
Formerly Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
DWIGHT D. BOWMAN
Affiliation:
Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York 14853, USA
*
*Corresponding author: Ross University School of Veterinary Medicine, PO Box 304, Basseterre, St. Kitts and Nevis, West Indies. Tel: +1-732-898-0055. Fax: +1-869-465-1203. E-mail: jketzis@rossvet.edu.kn

Summary

Premunition is the state in a disease where an existing infection protects the host from reinfection with the same species. The cause of premunition is not clearly understood. In this study, we hypothesized that kin-selection might be a contributing factor in premunition. To test this theory, sheep were infected either once with a linguiform or smooth vulval morphotype of Haemonchos contortus, twice with the same morphotype or twice with different morphotypes. All infections resulted in a similar number of adult parasites. However, there were differences in the morphotypes recovered providing potential evidence of kin selection. Negative interference competition might also contribute to the reduction of the incoming population. Allelopathic or physical interactions between the parasites may be the mechanism behind the observed phenomena.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2016 

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