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Factors affecting the acquisition of resistance against Schistosoma mansoni in the mouse. I. Demonstration of resistance to reinfection using a model system that involves perfusion of mice within three weeks of challenge

Published online by Cambridge University Press:  05 June 2009

M. Doenhoff ,
Q. Bickle ,
E. Long ,
J. Bain  and
A. McGregor
M. Doenhoff
Affiliation:
Department of Medical Helminthology, London School of Hygiene and Tropical Medicine, Winches Farm Field Station, St. Albans AL4 0XQ, England
Q. Bickle
Affiliation:
Department of Medical Helminthology, London School of Hygiene and Tropical Medicine, Winches Farm Field Station, St. Albans AL4 0XQ, England
E. Long
Affiliation:
Department of Medical Helminthology, London School of Hygiene and Tropical Medicine, Winches Farm Field Station, St. Albans AL4 0XQ, England
J. Bain
Affiliation:
Department of Medical Helminthology, London School of Hygiene and Tropical Medicine, Winches Farm Field Station, St. Albans AL4 0XQ, England
A. McGregor
Affiliation:
Department of Medical Helminthology, London School of Hygiene and Tropical Medicine, Winches Farm Field Station, St. Albans AL4 0XQ, England
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Abstract

The degree of resistance acquired by Schistosoma mansoni-infected mice against homologous challenge has been determined by perfusion of the animals within three weeks of the challenge, at which time the challenge-derived organisms were morphologically distinguishable from the primary infection which induced the resistance. The method has been compared with assays based on determination of the number of organisms migrating through the lung, and with perfusions at a later time when the challenge has matured. The results obtained with the three week perfusion method, showing that resistance was acquired by eight weeks after a primary infection, were confirmed by the longer survival of, and reduced egg excretion rates and tissue egg burdens in the experimental animals relative to respective challenge control animals. However, some discrepancy in challenge-derived worm numbers was found between animals perfused three weeks after challenge and those autopsied at later times. The possible reasons for this difference are discussed. The degree of resistance that was acquired was to some extent dependent on the size of the challenge infection.

Type
Research Papers
Information
Journal of Helminthology , Volume 52 , Issue 3 , September 1978 , pp. 173 - 186
Copyright
Copyright © Cambridge University Press 1978

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