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目的:了解内蒙古自治区鼠疫自然疫源地鼠疫耶尔森菌（鼠疫菌）对11种抗生素的耐药情况，为科学有效地选择抗生素治疗鼠疫提供理论依据。方法:收集137株分离自内蒙古自治区鼠疫自然疫源地不同时间、不同地区、不同宿主和媒介的鼠疫菌，采用美国临床和实验室标准协会（Clinical and Laboratory Standard Institute，CLSI）药敏试验方法中的琼脂稀释法，分别测定氧氟沙星、环丙沙星、硫酸卡那霉素、硫酸链霉素、头孢曲松钠、氨苄青霉素钠、氯霉素、盐酸壮观霉素、头孢呋辛钠、盐酸四环素、磺胺甲恶唑-甲氧苄啶共11种抗生素对137株鼠疫菌的最低抑菌浓度（MIC），计算MICn 50、MICn 90（能抑制50%、90%细菌生长的最低药物浓度）；并根据CLSI标准判定其敏感性。n 结果:检测的137株鼠疫菌未发现对氧氟沙星、环丙沙星、硫酸卡那霉素、硫酸链霉素、头孢曲松钠、氨苄青霉素钠、氯霉素、盐酸壮观霉素、头孢呋辛钠、盐酸四环素和磺胺甲恶唑-甲氧苄啶具有单独或多重耐药性。根据CLSI标准，137株鼠疫菌对11种抗生素均敏感；其中，氧氟沙星、环丙沙星、头孢曲松钠及磺胺甲恶唑-甲氧苄啶的抗菌活性较高，MICn 90均< 0.250 μg/ml；盐酸壮观霉素的抗菌活性最低，MICn 90为16.000 μg/ml。n 结论:内蒙古自治区鼠疫自然疫源地内分离的鼠疫菌未发现对11种抗生素具有单独或多重耐药性，应对鼠疫菌进行持续的耐药监测，为临床用药提供依据。“,”Objective:To investigate the drug resistance of n Yersinia pestis to 11 kinds of antibiotics in the natural foci of plague in Inner Mongolia Autonomous Region, and to provide a theoretical basis for scientifically and effectively selecting antibiotics for treatment of the plague.n Methods:A total of 137 strains of n Yersinia pestis isolated from the natural foci of plague in Inner Mongolia Autonomous Region at different times, regions, hosts and vectors were collected. According to Clinical and Laboratory Standard Institute (CLSI), the agar plate dilution method was used to determine the minimum inhibitory concentration (MIC) of the 11 kinds of antibiotics against 137 strains of n Yersinia pestis, including ofloxacin, ciprofloxacin, kanamycin, streptomycin, ceftriaxone, ampicillin, chloramphenicol, spectinomycin, cefuroxime, tetracycline and sulfamethoxazole-trimethoprim. The MICn 50 and MICn 90 (the minimum concentration of drug which could inhibit 50% and 90% of bacterial growth) were calculated, and their sensitivity was determined according to CLSI standards.n Results:Among 137 strains of n Yersinia pestis tested, no strains of n Yersinia pestis had single or multiple resistance to ofloxacin, ciprofloxacin, kanamycin, streptomycin, ceftriaxone, ampicillin, chloramphenicol, spectinomycin, cefuroxime, tetracycline and sulfamethoxazole-trimethoprim. According to CLSI standards, 137 strains of n Yersinia pestis were all sensitive to the 11 kinds of antibiotics; among them, ofloxacin, ciprofloxacin, ceftriaxone and sulfamethoxazole-trimethoprim had higher antibacterial activity, with MICn 90 < 0.250 μg/ ml; the antibacterial activity of spectinomycin was the lowest, with MIC n 90 of 16.000 μg/ml.n Conclusions:The n Yersinia pestis isolated from the natural foci of plague in Inner Mongolia Autonomous Region is not found to have single or multiple resistance to the 11 kinds of antibiotics. Continuous drug resistance monitoring of n Yersinia pestis should be carried out to provide a basis for clinical medication.n