Sanchez-Carlo V, Wilson R A, McDonald J S, Packer R A
Am J Vet Res. 1984 Sep;45(9):1771-4.
Biochemical and serologic characteristics of 184 Escherichia coli isolates from cows with acute mastitis were determined. Trends or patterns unique to bovine isolates were not observed, except for the frequency of adonitol fermentation, which was positive in 84 (45.6%) of the cultures. Growth on Tergitol-7 agar had 3 types of colony morphologic characteristics; of these, the rough and intermediate textures predominated over those with smooth colony surfaces. A large variety of serovars was detected; the majority occurring as single isolates within a herd. Few K antigens were typeable. Only 2 isolates contained the K99 antigen. Seemingly, E coli organisms isolated from cows with acute mastitis cannot be distinguished as a specific pathogenic group on the basis of biochemical and serotest reactions.
对从患有急性乳腺炎的奶牛中分离出的184株大肠杆菌进行了生化和血清学特征测定。除了阿东醇发酵频率外，未观察到牛源分离株特有的趋势或模式，84份（45.6%）培养物的阿东醇发酵呈阳性。在Tergitol-7琼脂上生长有3种菌落形态特征；其中，粗糙和中间质地的菌落比菌落表面光滑的菌落更常见。检测到多种血清型；大多数在牛群中以单一分离株形式出现。很少有K抗原可分型。仅2株分离株含有K99抗原。显然，根据生化和血清学试验反应，从患有急性乳腺炎的奶牛中分离出的大肠杆菌不能被区分为特定的致病菌群。
