不同种布氏菌在外界各种因素的影响下可以发生变异,一般认为变异的布氏菌表面的某些成份和化学结构发生改变。这种变异的细菌其代谢和核苷酸排列序列不易改变,应用细菌返祖或测定布氏菌氧化代谢的方法,可以将大多数非典型布氏菌株鉴定出来。笔者对镇赉县马场羊群进行了布氏菌血清学调查,血检羊140只,阳性22只,对其中4只进行无菌剖杀,取肝、脾、肠系膜淋巴结做细菌学检查。 Different types of bacteria in the outside world under the influence of various factors can be mutated, it is generally believed that the variation of certain components of the surface of brucellosis and chemical structure changes. This variant of the bacterial metabolism and nucleotide sequence is not easy to change the sequence, the use of bacteria to return ancestor or determination of the method of oxidative metabolism of brucellosis, most of the atypical strains of Brucella can be identified. The author conducted a serological survey of brucellosis in Zhenlai County racecourse flocks. 140 blood samples were collected and 22 were positive. Four of them were aseptically killed and liver, spleen and mesenteric lymph nodes were taken for bacteriological examination.