Eosinophilic myositis and muscular sarcocystosis in the carcasses of slaughtered cattle and lambs.
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.
Jensen
R
R
Alexander
A F
AF
Dahlgren
R R
RR
Jolley
W R
WR
Marquardt
W C
WC
Flack
D E
DE
Bennett
B W
BW
Cox
M F
MF
Harris
C W
CW
Hoffmann
G A
GA
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*