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内蒙古昭盟地方病防治站1979年在科左中旗,从羊标本中检出142株布氏菌。经鉴定有羊型菌69株,牛型菌73株共6个生物型见表1。对142株菌用热凝集法做变异检查,结果69株羊型菌中53株变异(76.8％),73株牛型菌中2株变异(2.7％)。羊型菌变异率如此之高,这么多牛型菌转移到羊在我区既往是没有发现过的。本所1974—1979年连续6年收到锡盟厢黄旗从羊标本中检出的106株羊型菌,传代保存至今,变异率仅为6.6％。用豚鼠脾菌数法对其中8株羊型菌和5株牛型菌反复做了27次毒力测定,均为弱毒菌。同时对羊、牛型菌各1株连续通过豚鼠5代用同样的方法进行毒力测
In 1979, Inner Mongolia Zhaomei endemic disease prevention and control station in Kezuozhongqi, from the sheep specimens detected 142 strains of brucellosis. A total of 69 sheep strains and 73 cattle strains were identified. A total of 142 isolates were detected by thermal agglutination. The results showed that of the 69 isolates, 53 isolates (76.8%) and 2 out of 73 isolates (2.7%) showed variation. Mutant sheep mutton rate is so high, so many cattle transfer to sheep in our area has not been found in the past. The Institute from 1974 to 1979 for six consecutive years received Ximei Xiang yellow flag from the sheep specimens were detected 106 strains of sheep, pass the date of preservation, the mutation rate was only 6.6%. With guinea pig spleen number method of which 8 strains of sheep and 5 strains of bovine repeatedly made 27 virulence tests were weak toxins. At the same time, sheep, bovine fungi each successive passage of guinea pigs 5 generations using the same method of virulence test