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Coccidia
(view source)
Revision as of 10:56, 16 November 2008
869 bytes added
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10:56, 16 November 2008
→Coccidia of Poultry
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==Coccidia of Poultry==
==Coccidia of Poultry==
[[Image:Buff orpington.jpg|thumb|right|150px|Buff orpington - nabrown RVC]]
[[Image:Buff orpington.jpg|thumb|right|150px|Buff orpington - nabrown RVC]]
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*Direct life cycle
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*1 week prepatent period
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*After oocysts are ingested, sporozoites are released which penetrate the intestinal epithelium
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*2 asexual phases of multiplication called schizongony occur followed by a phases of sexual multiplication called gametogeny
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*Zygote develops an oocyst which is shed in the faeces
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**Oocyst measures 20-30μm
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*For each oocyst ingested, thousands are shed
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*Life cycle is '''self-limiting'''
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**Organisms from a single infection go through the sequence of developmental stages synchronously
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**Organisms leave the body simultaneously as oocysts
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*Oocysts are only infective once they have sporulated
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**Sporulation requires warmth, moisture and oxygen
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**Takes 2-3 days in broiler houses
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*Oocysts contain 4 sporocysts each with 2 sporozoites
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'''Pathogenesis'''
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'''Diagnosis'''
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'''Immunity'''
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'''Epidemiology'''
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'''Control'''
==Other Avian Coccidia==
==Other Avian Coccidia==
Nabrown
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