Volume 51, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A captive-born rhesus monkey () experimentally infected with simian immunodeficiency virus developed neurologic abnormalities approximately seven months postinoculation. A chronic necrotizing encephalomyelitis with intralesional protozoal schizonts was diagnosed histologically. The protozoa was identified as based on its morphologic characteristics by light and electron microscopic examination, the developmental stages of the schizonts, and positive staining with antisera against by immunocytochemical techniques. Although may be confused with by light microscopy, the former lacks rhoptries, is in direct contact with the host cell cytoplasm, and divides by endopolygeny. has recently been identified as an etiologic agent of encephalomyelitis in horses, raccoons, and mink.


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