Crawford R P, Williams J D, Huber J D, Childers A B
J Am Vet Med Assoc. 1979 Dec 15;175(12):1274-7.
Four Texas cattle herds containing cows infected with either Brucella abortus biotype 1, 2, or 4 were studied to determine the probability of transmission of Brucella between adjacent cattle herds, the most probable means by which Brucella was introduced into the herds, and the relative frequency of strain 19 isolation from vaccinated cattle. A total of 1,935 cattle in the four herds were tested for brucellosis; 339 reactors were identified, and isolations of B abortus were made from 143. The biotype of B abortus was used to determine that purchased cattle or reentry of bred heifers into the herds was probably responsible for introducing B abortus and that the biotype was not readily transmitted to adjacent herds. Three (9%) of 32 B abortus isolations from adult-vaccinated cattle were strain 19. The data supported the hypothesis that biotypes can be useful in determining the source of B abortus for cattle and in differentiating field and vaccine strain infections in adult-vaccinated cattle.
对得克萨斯州的四个牛群进行了研究，这些牛群中包含感染了流产布鲁氏菌生物型1、2或4的母牛，目的是确定布鲁氏菌在相邻牛群间传播的可能性、布鲁氏菌引入牛群最可能的途径，以及从接种疫苗的牛中分离出19号菌株的相对频率。对这四个牛群中的总共1935头牛进行了布鲁氏菌病检测；鉴定出339头反应动物，并从143头牛中分离出流产布鲁氏菌。利用流产布鲁氏菌的生物型确定，购入的牛或经配种的小母牛重新进入牛群可能是引入流产布鲁氏菌的原因，且该生物型不易传播至相邻牛群。从成年接种疫苗的牛中分离出的32株流产布鲁氏菌中有3株（9%）为19号菌株。这些数据支持了以下假设：生物型可用于确定牛群中流产布鲁氏菌的来源，并区分成年接种疫苗的牛的田间感染和疫苗株感染。
