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Redescriptions of Eimeria irresidua Kessel & Jankiewicz, 1931 and E. flavescens Marotel & Guilhon, 1941 from the domestic rabbit

Published online by Cambridge University Press:  06 April 2009

C. C. Norton ,
Janet Catchpole  and
L. P. Joyner
C. C. Norton
Affiliation:
Central Veterinary Laboratory, Weybridge, Surrey
Janet Catchpole
Affiliation:
Central Veterinary Laboratory, Weybridge, Surrey
L. P. Joyner
Affiliation:
Central Veterinary Laboratory, Weybridge, Surrey
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Summary

Eimeria flavescens and E. irresidua from the domestic rabbit are redescribed. The relatively smaller ovoidal oocysts of E. flavescens which measure on average 31·7 × 21·4 μm, possess a wide micropyle at the broad end. First-generation schizonts of this species develop deep in the glands of the lower small intestine. Merozoites migrate to the caecum and colon where second, third and fourth-generation schizonts develop in the superficial epithelium followed by the fifth-generation schizonts and gametocytes which form in the glands. In young Dutch rabbits E. flavescens is very pathogenic; low doses of oocysts produce a severe enteritis with high mortality and morbidity. The larger, broadly ellipsoidal oocysts of E. irresidua measure on average 38·4 × 23·2 μm and often possess a very small cryptic oocyst residuum. The endogenous stages develop in the small intestine only; first-generation schizonts in the glands and second-generation schizonts in the lamina propria whilst third and fourth-generation schizonts and gametocytes develop in the villous epithelium. E. irresidua is not pathogenic in young Dutch rabbits; even heavy infections produce only a transient pause in weight gain.

Type
Research Article
Information
Parasitology , Volume 79 , Issue 2 , October 1979 , pp. 231 - 248
Copyright
Copyright © Cambridge University Press 1979

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