title: Eosinophilic myositis and muscular sarcocystosis in the carcasses of slaughtered cattle and lambs.
abstract: Fifty-three bovine and 7 ovine carcasses condemned for having eosinophilic myositis were evaluated. Four (7.3%) of the bovine carcasses had a few, large local lesions in skeletal muscles (category A), and 49 (92.7%) of the bovine carcasses and 7 (100%) of the ovine carcasses had multiple, small, disseminated lesions in tongue, esophagus, heart, diaphragm, or skeletal muscles (category B). Tissue from carcasses of category B were evaluated for bacteria, viruses, selenium, and pathologic changes. Pathogenic bacteria and viruses were not isolated and selenium concentrations were normal. In category B, all carcasses had granulomas; of the 49 bovine carcasses and 7 ovine carcasses, 38 (77.6%) and 7 (100%), respectively, had one or more granulomas with opened dead sarcocysts. The data indicated that opened sarcocysts killed the host myocyte and adjacent myocytes and stroma, thereby initiating granuloma formation.
authors.forename: R
authors.initials: R
authors.lastname: Jensen
authors.forename: A F
authors.initials: AF
authors.lastname: Alexander
authors.forename: R R
authors.initials: RR
authors.lastname: Dahlgren
authors.forename: W R
authors.initials: WR
authors.lastname: Jolley
authors.forename: W C
authors.initials: WC
authors.lastname: Marquardt
authors.forename: D E
authors.initials: DE
authors.lastname: Flack
authors.forename: B W
authors.initials: BW
authors.lastname: Bennett
authors.forename: M F
authors.initials: MF
authors.lastname: Cox
authors.forename: C W
authors.initials: CW
authors.lastname: Harris
authors.forename: G A
authors.initials: GA
authors.lastname: Hoffmann
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000473:pathology*; D004804:Eosinophils / Q000166:cytology; D006099:Granuloma / Q000473:pathology / Q000662:veterinary; D006352:Heart Ventricles / Q000473:pathology; D009135:Muscular Diseases / Q000473:pathology / Q000662:veterinary*; D009206:Myocardium / Q000473:pathology; D009220:Myositis / Q000473:pathology / Q000662:veterinary*; D012523:Sarcocystosis / Q000473:pathology / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases / Q000473:pathology*