Kurek C
Pol Arch Weter. 1975;18(1):17-22.
Effect of six antibiotics on the hemolysin formation by 320 strains of Staphylococcus (including 112 S. aureus) and 100 strains of S. agalactiae isolated from cow udders, have been determined. Tests were performed on plates containing 5% horse red cells, but the hemolytic strains were tested on blood agar plates supplemented with 5% sheep, rabbit and calf cells in addition. One strain of S. aureus produced the rings of hemolysis around the zones of growth inhibition on the media containing the discs of penicillin, erythromycin, oxyterramycin and chloramphenicol. Another strain of S. agalactiae produced similar rings, but only on the medium supplemented with penicillin. On the calf blood agar plate, S. aureus produced the hemolytic rings only in association with streptomycin and neomycin. After five times of propagation on the nutrient agar, the hemolytic phenomenon was not reproducible. It may be suggested that in cow milk there are some inhibitors for hemolysin formation by Staphylococcus and S. agalactiae.
已测定六种抗生素对从奶牛乳房分离出的320株葡萄球菌（包括112株金黄色葡萄球菌）和100株无乳链球菌溶血素形成的影响。试验在含有5%马红细胞的平板上进行，但对溶血菌株还另外在补充有5%绵羊、兔和小牛细胞的血琼脂平板上进行了检测。一株金黄色葡萄球菌在含有青霉素、红霉素、土霉素和氯霉素纸片的培养基上，于生长抑制区周围产生了溶血环。另一株无乳链球菌也产生了类似的环，但仅在补充有青霉素的培养基上。在小牛血琼脂平板上，金黄色葡萄球菌仅与链霉素和新霉素一起产生溶血环。在营养琼脂上传代五次后，溶血现象无法重现。可以推测，牛奶中存在一些抑制葡萄球菌和无乳链球菌溶血素形成的物质。
