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*Oocysts are sporulated when passed
 
*Oocysts are sporulated when passed
 
**Difficult to find on faecal examination as the sporocysts are few in number and small
 
**Difficult to find on faecal examination as the sporocysts are few in number and small
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*Ingestion of sporocyst by intermediate host
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**2 phases of rapid asexual reproduction in vascular endothelial cells
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**Slow multiplication of bradyzoites in muscle tissue
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**Sarcocyst forms with bradyzoites inside, surrounded by a cyst wall and divided into compartments
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'''Epidemiology'''
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*Final hosts are carnivores and omnivores
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*Intermediate hosts are herbivores and omnivores
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*Humans are the final host for some species and the intermediate hosts for others
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**Final host for species infecting cattle and pigs
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*Dogs are final hosts for species infecting cattle, sheep, goats, pigs and horses
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*Cats are final hosts for species infecting cattle, sheep and pigs
    
'''Pathogenesis'''
 
'''Pathogenesis'''
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*Widespread infection but mostly asymptomatic
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*Cause meat inspection losses
 
*Cause meat inspection losses
    
*''Sarcocystis'' in [[Muscles Inflammatory - Pathology#Protozoa|myositis]]
 
*''Sarcocystis'' in [[Muscles Inflammatory - Pathology#Protozoa|myositis]]
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*Experimental infections cause severe, acute pyrrhexic disease when the organism multiplies in the vascular endothelium
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*Can cause chronic wasting disease in cattle and horses
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**Causes abortion and post-natal disease in sheep
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*Equine protozoal myeloencephalitis
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**Necrotising encephalomyelitis affecting the grey and white matter of the CNS
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**Caused by ''S.neurona''
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**Opossum thought to be the definitive host
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**Horses thought to be accidental hosts
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**Natural intermediate hosts currently unknown
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**Western Blotting shows 50% of horses in the USA are seropositive
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**Risk factors poorly understood
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**Causes spinal cord dysfunction
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***Ataxia and paralysis
    
==Neospora==
 
==Neospora==
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