高毒力肺炎克雷伯菌新型变种感染病例分析及耐药机制研究

被引:15
作者
魏丹丹 [1 ]
刘洋 [1 ]
万腊根 [1 ]
余阳 [1 ]
邓琼 [2 ]
曹先伟 [2 ]
机构
[1] 南昌大学第一附属医院检验科
[2] 南昌大学第一附属医院感染控制科
关键词
肺炎克雷伯菌; 毒力; 抗药性, 细菌; 血清分型;
D O I
暂无
中图分类号
R446.5 [微生物学检验];
学科分类号
100208 [临床检验诊断学];
摘要
目的研究高毒力肺炎克雷伯菌新型变种(hvKP)临床感染分布及对常用抗菌药物的耐药情况, 分析相关耐药机制, 并对毒力表型进行探讨。方法回顾性研究。收集2011年1月至2013年12月南昌大学第一附属医院分离的210株非重复肺炎克雷伯菌及其药敏结果, 筛选出12株hvKP菌;多位点序列分型(MLST)及肠杆菌科基因间重复一致序列(ERIC)-PCR对hvKP菌株进行分子流行病学研究;产超广谱β内酰胺酶(ESBL)菌株和碳青霉烯酶菌株检测分别应用双纸片协同及确认试验和改良Hodge试验;PCR及测序检测耐药基因型、血清荚膜分型及毒力基因;黏液丝试验确定菌株的高黏液型(HM)表型。结果 hvKP菌对15种抗生素的耐药情况严重, ESBL检出率高达8/12, 1株改良Hodge试验阳性。12株hvKP中共发现5种ERIC-MLST分子克隆分型, A/ST23和B/ST263为主要型别, 分别占5/12和4/12。PCR及测序结果显示, blaKPC-2 1株, qnrA1 9株, qnrB4 7株, qnrS1 7株, blaCTX-M-3 6株, blaCTX-M-14 7株, blaTEM-1 10株, blaSHV-12 4株。K1血清型11株, K2血清型1株, 未检出其他血清型。毒力基因magA、rmpA和产气菌素检出率分别为11/12、9/12和9/12。此外, kfu基因、mrkD基因、wabG基因及allS基因的携带率分别为9/12、10/12、4/12和2/12。HM阳性率为8/12。结论分离出多重耐药hvKP菌株, 耐药机制复杂多样, 由多种主要分子克隆引起, 且存在强毒性血清型和多种毒力基因, 应引起临床高度重视, 必须采取有效措施控制其传播。(中华检验医学杂志, 2015, 38: 392 -396)
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