Pathology of Acute Necrotizing Mastitis Caused by Staphylococcus aureus in a Dairy Cow

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X

Acute necrotizing mastitis in a cow was investigated pathologically. The udder was firmly enlarged to twice the size of a basketball. Histologically, the epithelium of the interlobular duct of the mammary glands was displaced by necrotic debris and bacterial clumps (Grampositive cocci). The intralobular ducts were also necrotic. The alveoli showed scattered necrotic foci varying in size and containing bacterial clumps. The vascular walls of the interlobular stroma exhibited fibrinous necrosis with fibrinous thrombi. The liver showed centrolobular fatty and droplet degeneration of the hepatocytes. Extramedullary hematopoiesis was observed in the liver, spleen, adrenal glands, lungs and kidneys. The bacteria observed in the lesions of the mammary glands were stained positively with immunoperoxidase using an antibody against Staphylococcus aureus. Ultrastructurally, the bacteria were round or oval in shape and had thick cellular walls. Capsule-like fibrous material was present around the surface of the bacteria. Bacteriologically, Staph. aureus was isolated in pure culture from the mammary gland. These findings suggest that Staph. aureus caused the acute necrotizing mastitis. The pathogenesis of the disease was examined.

作成者 Tomoyuki SHIBAHARA Kikuyasu NAKAMURA
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 139
終了ページ 142
言語 eng