Difference between revisions of "Coccidia"

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==''Eimeria'' spp.==
 
 
 
==''Isospora'' spp.==
 
 
 
==Coccidia of Poultry==
 
 
 
==Other Avian Coccidia==
 
 
 
==Coccidia of Sheep==
 
*Different species of ''Eimeria'' occurs in sheep and goats
 
 
 
==Coccidia of Goats==
 
*Many ''Eimeria'' species
 
 
 
*2 ''Eimeria'' are pathogenic
 
**Cause [[Intestine Diarrhoea - Pathology|diarrhoea]] and a decreased growth rate
 
 
 
*Different species of ''Eimeria'' occurs in sheep and goats
 
 
 
==Coccidia of Horses==
 
*Only one atypical ''Eiemria''
 
 
 
*Forms large subepithelial gametocytes in villi
 
 
 
*Large, dark coloured oocysts
 
**Approximately 12μm
 
 
 
*Occasionally causes [[Intestine Diarrhoea - Pathology|diarrhoea]]
 
 
 
==Coccidia of Pigs==
 
*Many species of ''Eimeria'' and ''Isospora''
 
 
 
*Only ''Isospora suis'' is of clinical pathogenic importance
 
 
 
*Causes sporadic, serious and sometimes fatal disease in unweaned piglets
 
**Causes profuse [[Intestine Diarrhoea - Pathology|diarrhoea]]
 
 
 
*Very short 1 week prepatent period
 
 
 
*[[Intestine Diarrhoea - Pathology|Diarrhoea]] starts before oocysts are shed in faeces
 
**Ante-mortem diagnosis is difficult
 
 
 
*Death usually occurs after parasites have left the host
 
**Post-mortem diagnosis difficult
 
**''Isospora'' infections are '''self-limiting'''
 
 
 
==Coccidia of Dogs==
 
*2 common and 2 less common ''Isospora'' species
 
 
 
*Occasionally can cause disease
 
 
 
*Little pathogenicity
 
 
 
*Even if faecal oocyst count is high, other causes of [[Intestine Diarrhoea - Pathology|diarrhoea]] should be looked for
 
 
 
==Coccidia of Cats==
 
[[Image:Coccidia.jpg|thumb|right|150px|Coccidia in Cat Faeces - Joel Mills]]
 
*2 common ''Isospora'' species with little clinical significance
 
 
 
*Oocysts in faeces have to be distinguised from those of ''Toxoplasma'' (smaller) and ''Sarcocytis'' (sporulated or naked sporocyts in faeces)
 
 
 
==Coccidia of Rabbits==
 
 
 
*''Besnoitia bennetti'' in [[Respiratory Parasitic Infections - Pathology#Besnoitia bennetti|larynx]] of horses
 
*''Hepatozoon americanum'' and subclinical ''H. canis'' in [[Bones Hyperplastic and Neoplastic - Pathology#Hepatozoon|periosteal bone formation]]
 
**Both are Tick borne diseases
 
***''H. canis'' – ''Rhipicephalus sanguineus''
 
***Ticks become infected by ingesting a blood meal containing macrophages and neutrophils infected with the parasite gamonts -> sexual replication in the gut of the tick -> oocysts containing infective sporozoites -> dogs ingest the tick  schizogony occurs in numerous tissues.
 

Latest revision as of 16:48, 20 May 2010

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