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Coccidia (view source)

Revision as of 19:18, 16 November 2008

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*''Eimeria tenella''

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**Swollen caeca

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**Swollen [[Caecum - Anatomy & Physiology|caeca]]

**Thickening of wall

**Dark colouring containing a core of necrotic tissue and blood

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**2 important pathogenically

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*''Eimeria'' in caeca causes petechial haemorrhages and caseous caecal cores

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*''Eimeria'' in [[Caecum - Anatomy & Physiology|caeca]] causes petechial haemorrhages and caseous [[Caecum - Anatomy & Physiology|caecal]] cores

*''Eimeria'' in the anterior and mid-intestine causes necrotic enteritis and petechial haemorrhages

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*3 ''Eimeria'' species

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*2 intestinal species causing macroscopic lesions in kidney tubules

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*2 intestinal species causing macroscopic lesions in [[Urinary System - Anatomy & PhysiologyThe Kidney|kidney tubules]]

**Oocysts carried in urine and pass out with faeces

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*Causes severe enteritis and mortality in ducklings

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**Haemorrhages and pale focal lesions in small intestine

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**Haemorrhages and pale focal lesions in [[Small Intestine - Anatomy & Physiology|small intestine]]

===Coccidia of Game Birds===

*3 main species

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*Caecal species most pathogenic causing white caecal cores

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*[[Caecum - Anatomy & Physiology|Caecal]] species most pathogenic causing white [[Caecum - Anatomy & Physiology|caecal]] cores

==Coccidia of Cattle==

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*''Eimeria bovis''

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**Endogenous stages in central lacteal of villi and epithelial cells of caecum and colon

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**Endogenous stages in central lacteal of villi and epithelial cells of [[Caecum - Anatomy & Physiology|caecum]] and [[Colon - Anatomy & Physiology|colon]]

**Causes [[Intestine Diarrhoea - Pathology|diarrhoea]] and enteritis

**Oocysts are 28x20μm

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*''Eimeria zuernii''

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**Endogenous stages in connective tissue of lamina propria of the lower small intestine and in the epithelial cells of the caecum and colon

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**Endogenous stages in connective tissue of lamina propria of the lower [[Small Intestine - Anatomy & Physiology|small intestine]] and in the epithelial cells of the [[Caecum - Anatomy & Physiology|caecum]] and [[Colon - Anatomy & Physiology|colon]]

**More pathogenic than ''Eimeria bovis''

**Causes blood stained dysentry, tenesmus and sloughed mucosa

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*Post-mortem

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**Diffuse inflammation and thickening of caecal mucosa (and sometimes ileal and colonic mucosa)

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**Diffuse inflammation and thickening of [[Caecum - Anatomy & Physiology|caecal]] mucosa (and sometimes [[Ileum - Anatomy & Physiology|ileal]] and [[Colon - Anatomy & Physiology|colonic]] mucosa)

**Masses of gamonts and oocysts in scrapings

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==Coccidia of Rabbits==

*3 pathogenic ''Eimeria'' species

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**2 in the caecum

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**2 in the [[Caecum - Anatomy & Physiology|caecum]]

**1 in the bile duct

*''Eimeria steidae''

**Parasitises the bile duct epithelium

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**Travels via the bile duct to the liver where it forms large white nodules

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**Travels via the bile duct to the [[Liver - Anatomy & Physiology|liver]] where it forms large white nodules

**Oocysts travel in the bile and are passed out in the faeces

**Causes ascites, [[Intestine Diarrhoea - Pathology|diarrhoea]], weight loss and polyuria

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