Chronic eosinophilic myositis is reported in a Rhesus monkey with disseminated sarcosporidiosis. Extension of all four limbs was limited, and sclerosis of the affected muscles was present. Sarcocysts were present in all affected muscles. This is thought to be the first report of this condition in a Rhesus monkey. The etiological relationship of Sarcocystis sp. to eosinophilic myositis is discussed.
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