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Title:   Author  item
                                            DAVIS, C - UNIVERSITY OF CALIFORNIAitem
                                            BARR, B - UNIVERSITY OF CALIFORNIAitem
                                            PASCOE, J - UNIVERSITY OF CALIFORNIAitem
                                            OLANDER, H - UNIVERSITY OF CALIFORNIAitem
                                            Dubey, Jitender
  Submitted to: Journal of Parasitology
                                    Publication Type: Peer Reviewed Journal
                                    Publication Acceptance Date: 6/20/1999
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary: Parasites of the genus Sarcocystis are single-celled organisms that can cause anemia, weigh loss, abortion and death in livestock.  Although Sarcocystis infection is common in horses, the parasite has not been shown to infect the liver.  Scientists at the Beltsville Agricultural Research Center and the University of California, Davis report for the first time  severe acute hepatitis in a horse from California.  The results will be of use to parasitologists, pathologists, and veterinarians.
                                Technical Abstract: Hepatic sarcocystosis was diagnosed in a horse in association with refractory bacterial osteomyelitis and plasma-cell tumor of the maxilla and hepatic salmonellosis. Gross lesions included pleural, pericardial, and peritoneal effusions, serosal hemorrhages, hepatomegaly, gastric ulceration, colonic edema, and proliferative tissues filling 2  maxillarydental alveoli. Histologically, liver was characterized by severe suppurative, necrotizing, periportal hepatitis, and severe periacinar necrosis. Hepatocytes frequently contained protozoal schizonts in various stages of development. In mature schizonts, merozoites were often arranged radially around a central residual body, consistent with asexual division by endopolygeny. Ultrastructural features of merozoites included an apical conoid and polar ring, anterior micronemes, central nuclei, and absence of rhoptries.  These protozoa did not react to antisera raised against  Neospora caninum, Sarcocystis neurona, Toxoplasma gondii, or Hammondia hammondi. The microscopic and ultrastructural characteristics and immunoreactivity of this organism are consistent with a Sarcocystis sp. other than S. neurona.  This is the first report of Sarcocystis-associated hepatitis in a horse.  The life cycle of this organism and source of infection are unknown.


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