Yokomizo Y, Isayama Y, Takahashi M, Yoshida K
Res Vet Sci. 1977 Mar;22(2):158-60.
Among 1598 strains of Staphylococcus aureus isolated from bovine mastitis milk samples, 19 exhibited a diffuse-type growth using the serum-soft agar (SSA) technique. By the application of a capsular typing method using the SSA technique, they could be separated into five different serological types. Mouse virulence of individual strains varied significantly. Two strains showed high mouse virulence but the majority showed relatively low virulence or were avirulent. The avirulent strains and those of low virulence were capable of absorbing protective antibodies from rabbit antisera to type strains of human encapsulated S aureus. These results suggested that encapsulated strains of S aureus may play a part in the pathogenesis of bovine mastitis.
在从牛乳腺炎乳汁样本中分离出的1598株金黄色葡萄球菌中，有19株在使用血清软琼脂（SSA）技术时呈现出扩散型生长。通过应用使用SSA技术的荚膜分型方法，它们可被分为五种不同的血清型。各个菌株的小鼠毒力差异显著。两株显示出高小鼠毒力，但大多数显示出相对较低的毒力或无毒力。无毒力菌株和低毒力菌株能够从兔抗血清中吸收针对人包膜金黄色葡萄球菌型菌株的保护性抗体。这些结果表明，金黄色葡萄球菌的包膜菌株可能在牛乳腺炎的发病机制中起作用。
