Protozoan parasites of domestic animals and of man by Levine Norman D

Author:Levine, Norman D
Language: eng
Format: epub, pdf
Tags: Protozoa, Pathogenic, Veterinary protozoology, Medical protozoology
Publisher: Minneapolis, Burgess Pub. Co
Published: 1961-03-25T05:00:00+00:00

THE TELOSPORASIDA AND THE COCCIDIA PROPER

211

Fig. 27. Morphology and developmental stages of species of Eiiiici'ki from the chukcn. 1-4. Stages in development of oocysts of Eiiiicyia IcnclUi. 5-7. Stages in development of oocysts of Eiiueria initio. 8-9. Stages in development of oocysts ol Eiuieria aceyvnlina. 10-13. Stages in development of oocysts of Eiiucria maxima. 14-17. Stages in development of oocysts of Eiiiicna iiccalyix. 18. Developmental stages in cecal epithelium 7 to 9 days after infection, oo = oocyst, sch = third generation schizont. nier = third generation nierozoite. mi = microgametocyte. ma = macrogamete. (From Tyzzer, 1929 in the Aincyicaii Junyiial uj Hygiene, published by the Johns Hopkins Press).

tenella is the most pathogenic and important species. In recent years, however, control of this species with coccidiostats has revealed more and more coccidiosis due to E. )iccalri.x. The other species may contribute to the total picture. E. brunelli is markedly pathogenic but uncommon. E. niaxiiiia and E. acerviilina are slightly to moderately pathogenic. Both are conunon. E. )iiitis and E. praecox are common but non-pathogenic. E. hagani is rare and only slightly if at all pathogenic. Weiiyonella galliiiae is rare but moderately pathogenic; it has

been found so far only in India. Crypto-sporidiiiiii tyzzeri is rare and non-pathogenic, laospora gallinae is rare if it is a chicken parasite at all, and is presumably non-pathogenic.

Coccidiosis is primarily a disease of young birds. Older birds are carriers. Birds become infected by ingesting oocysts along with their food or water. Under farm conditions, and even in the laboratory unless extreme precautions are taken, it is practically impossible to avoid exposure to at least a few oocysts.

Download

Copyright Disclaimer:
This site does not store any files on its server. We only index and link to content provided by other sites. Please contact the content providers to delete copyright contents if any and email us, we'll remove relevant links or contents immediately.