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Eimeria maxima: a comparison of two laboratory strains with a fresh isolate

Published online by Cambridge University Press:  06 April 2009

C. C. Norton  and
Helen E. Hein
C. C. Norton
Affiliation:
Central Veterinary Laboratory, Weybridge, Surrey
Helen E. Hein
Affiliation:
Central Veterinary Laboratory, Weybridge, Surrey
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Summary

Oocysts of the Weybridge and Houghton strains of Eimeria maxima and a fresh field isolate were similar and measured on average 30·9 × 22·4 μm. The Weybridge strain and the field isolate produced similar pathogenic effects in 6-week-old chickens, high doses causing 50–80% mortality and severe weight loss. The Houghton strain was slightly less pathogenic and few birds died but more oocysts were produced. With each strain, a single dose gave complete immunity to a light challenge with the homologous strain. Two or 3 immunizing doses gave complete immunity to a heavy homologous challenge but were not sufficient to protect against heterologous challenge.

Type
Research Article
Information
Parasitology , Volume 72 , Issue 3 , June 1976 , pp. 345 - 354
Copyright
Copyright © Cambridge University Press 1976

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