机构地区:[1]北京大学人民医院检验科,100044 [2]航空总医院检验科
出 处:《中华检验医学杂志》2013年第7期604-609,共6页Chinese Journal of Laboratory Medicine
基 金:国家自然科学基金资助项目(31170125);高等学校博士学科点专项科研基金(博导类)课题资助项目(20110001110043);北京市自然科学基金资助项目(5122041);教育部新世纪人才资助项目(NCET-10-0205)
摘 要:目的研究替加环素体外药敏检测的影响因素,并对检测方法进行评估。方法回顾性收集2010年1至12月中国13家教学医院临床分离的116株鲍曼不动杆菌和肺炎克雷伯菌,评价隔夜培养基、培养基品牌和批号对替加环素药敏检测的影响。按照2010年和2012年临床标本中替加环素的MIC分布比例随机选择鲍曼不动杆菌56株,肺炎克雷伯菌47株,以微量肉汤稀释法为参考方法,评估琼脂稀释法、纸片扩散法、MIC检测试纸条(MTS)和VitekGNl6板的一致性和错误率。结果琼脂稀释法分别使用隔夜培养基和新鲜配制培养基检测替加环素对鲍曼不动杆菌和肺炎克雷伯菌基本一致率分别为89.7%(52/58)和87.9%(51/58);不同培养基品牌(BBL和Oxoid)和批号检测替加环素对两种细菌的基本一致率和分类一致率均为100%;按照美国食品药品监督局的折点判定标准:琼脂稀释法、MTS法、YitekGNl6板与微量肉汤稀释法检测结果的分类一致率/基本一致率分别为77.7%(80/103)/99.0%(102/103),87.4%(90/103)/98.1%(101/103),64.1%(66/103)/76.7%(79/103);纸片扩散法与微量肉汤稀释法(FDA折点判定标准)的分类一致性分别为:79.6%(82/103,敏感≥14mm,耐药≤10mm),69.9%(72/103,敏感≥16mm,耐药≤12mm),34.0%(35/103,敏感≥19mm,耐药≤14mm)。结论替加环素的体外药敏检测应使用新鲜配制的培养基,不同培养基的品牌(BBL和Oxoid)和批号检测替加环素对鲍曼不动杆菌和肺炎克雷伯菌体外药敏结果无影响。琼脂稀释法和MTS法与微量肉汤稀释法相关性较好,而纸片扩散法、VitekGNl6板一致性较低。通过调整纸片扩散法折点有望提高一致性。Objective To investigate the factors affecting the susceptibility of tigecycline and assess the testing methods. Methods The 116 isolates of Acinetobacter baumannii and Klebsiella pneumoniae were collected in 13 hospitals from January to December, 2010, to evaluate the effects on the tigecycline susceptibility of the overnight medium, medium brand and lot number, respectively. The 56 isolates of Acinetobacter baumannii and the 47 isolates of Klebsiella pneumoniae were selected randomly according to the MIC distribution proportion in 2010 and 2012. The broth microdilution was taken as the reference method to evaluate the effects of the agar dilution, disk diffusion, MIC Test Strip (MTS) and Vitek2(GN16) on the susceptibility of tigecycline. Results The essential agreement (EA) of Acinetobacter baumannii and KlebsieUa pneumoniae is 89. 7% ( 52/58 ) and 87.9% ( 51/58 ) using overnight medium and fresh medium respectively. Both EA and categorical agreement ( CA ) of the different brands ( BBL and Oxoid ) and lotnumbers are 100% using agar dilution. According to the FDA break point criteria, the CA/EA is 77.7% ( 80/103)/99. 0% ( 102/103 ), 87.4% ( 90/103 )/98.1% ( 101/103 ), 64. 1% ( 66/103 )/76. 7% ( 79/ 103) using agar dilution, MTS, Vitek(GN16) with respect to broth microdilution. The CA is 79. 6% (82/ 103,S≥14 mm,R≤10 mm), 69. 9% (72/103,S≥16 mm,R≤12 mm) , 34.0% (35/103,S≥19 mm,R≤ 14 mm)using disk diffusion method compared with broth microdilution (FDA break point criteria). Conclusions The susceptibility of tigeeycline must be tested using fresh medium. The medium brands and lot numbers used in this test have no effects on the tigecycline susceptibility to Acinetobacter baumannii and Klebsiella pneumoniae. There exist the better correlations on MIC using agar dilution and MTS than the disk diffusion and Vitek ( GN16 ) compared with broth microdilution. It is expected that the consistency can be improved by adiusting the break
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