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Population dynamics in echinococcosis and cysticercosis: regulation of Taenia hydatigena and T. ovis in lambs through passively transferred immunity

Published online by Cambridge University Press:  06 April 2009

M. A. Gemmell ,
J. R. Lawson ,
M. G. Roberts  and
J. F. T. Griffin
M. A. Gemmell
Affiliation:
Hydatid Research Unit, University of Otago Medical School, P.O. Box 913, Dunedin, New Zealand
J. R. Lawson
Affiliation:
Hydatid Research Unit, University of Otago Medical School, P.O. Box 913, Dunedin, New Zealand
M. G. Roberts
Affiliation:
Wallaceville Animal Research Centre, MAFTech, Ministry of Agriculture and Fisheries, P.O. Box 40063, Upper Hutt, New Zealand
J. F. T. Griffin
Affiliation:
Department of Microbiology, University of Otago Medical School, P.O. Box 913, Dunedin, New Zealand
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Summary

A comparison has been made of the interactions between passively transferred and actively acquired immunity in regulating populations of Taenia hydatigena and T. ovis. When ewes were grazed prior to parturition under a high infection pressure, immunity was transferred to their offspring for up to 8 weeks. A qualititative difference between the species was the destruction of larval T. ovis prior to their establishment (‘pre-encystment immunity’) and that of T. hydatigena after they had become established (‘post-encystment immunity’) in the challenged lambs. The major difference in terms of population regulation between the two parasites was that infection occurred with T. hydatigena but not with T. ovis in those lambs reared from birth for 16 weeks under high infection pressure. Passive, like active immunity, is a density-dependent constraint. It plays an important role in the population regulation of T. ovis, but not of T. hydatigena. This is discussed in terms of transmission in the natural environment, an hypothesis on humoral protection and the need to elucidate pathways of protection when immunization schedules are being evaluated for controlling the taeniid zoonoses.

Keywords

cysticercosisTaenia hydatigenaTaenia ovispopulation dynamicspassive immunity
Type
Research Article
Information
Parasitology , Volume 101 , Issue 1 , August 1990 , pp. 145 - 151
Copyright
Copyright © Cambridge University Press 1990

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