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Tissue cyst-forming coccidia (view source)
Revision as of 18:36, 18 November 2008
, 18:36, 18 November 2008→Sarcocystis
*''Sarcocystis'' should be differentiated from other tissue-cyst forming coccidia
*''Sarcocystis'' should be differentiated from other tissue-cyst forming coccidia
*There are many species of ''Sarcocystis''
*There are many species of ''Sarcocystis'' which differ in size from microscopic to several centimetres in length
**''S.neurona'' is an important equine pathogen in the USA
*Infective cyst in the intermediate host is called a '''sarcocyst'''
'''Life Cycle'''
*Individual life cycles incompletely misunderstood
*Indirect life cycle
*Life cycle alternates between the final and the obligatory intermediate host
*Only '''one''' final and '''one''' intermediate host
*Sporulated oocyst has 2 sporocysts containing 4 sporozoites
*Sporulated oocyst has 2 sporocysts containing 4 sporozoites
**Naked oocyst usually seen in faeces as the oocyst wall is very delicate
**Naked oocyst usually seen in faeces as the oocyst wall is very delicate
**Oocyst measures 15μm in length
*Indirect life cycle
*No schizogony in final host
*Gametogeny occurs deep in subepithelial tissue
*Life cycle alternates between the final and the obligatory intermediate host
*Faecal oocyst count is low
*Only one final and one intermediate host
*Oocysts are sporulated when passed
**Difficult to find on faecal examination as the sporocysts are few in number and small
'''Pathogenesis'''
'''Pathogenesis'''
*Cause meat inspection losses
*''Sarcocystis'' in [[Muscles Inflammatory - Pathology#Protozoa|myositis]]
*''Sarcocystis'' in [[Muscles Inflammatory - Pathology#Protozoa|myositis]]