产金属β-内酰胺酶的鲍氏不动杆菌在我国内地出现

获得性金属p内酰胺酶(金属酶)已经在全球出现．并且能导致对几乎所有p一内酰胺类抗生素耐药。近来，金属酶已经在我国的铜绿假单胞菌和杨氏柠檬酸菌中发现．但尚未在鲍氏不动杆菌中发现。2002和2003年．从四川大学华西医院的临床标本中分离出一些亚胺培南耐药或头孢他啶高度耐药的鲍氏不动杆菌菌株。通过亚胺培南联合亚胺培南一EDTA一邻二氮菲或头孢他啶联合头孢他啶一EDTA一邻二氮菲的琼脂稀释法，检测出12株不重复的鲍氏不动杆菌产金属酶。这些产金属酶的菌株主要分离自机械通气相关性肺炎患者的痰标本。PCR扩增IMP一4和VIM一2的编码基因无阳性结果。说明这些菌株所产的金属酶并非IMP一4、VTh^一9VTM—t壬兀VTh^一R持且首汗在弛同内*he硐古声A属酸的袖阵不；斗f饵苗

Emerging metallo-β-lactamases in clinical isolates of Acinetobacter baumannii in China inland

Acquired metallo-β-lactamases (MBLs) are emerging globally and can confer resistance to near all β-lactams. Recently, MBLs were found in Pseudomonas aeruginosa and Citrobacter youngae from China inland, but not in Acinetobacter baumannii. In 2002 and 2003, a few imipenem-resistant and/or ceftazidime-highly-resistant A. baumannii were isolated from clinical specimens in West China Hospital, Sichuan University. By agar dilution method used imipenem with imipenem plus EDTA-1, 10-phenanthroline and/or ceftazidime with ceftazidime plus EDTA-1, 10-phenanthroline, MBLs were detected in 12 nonreplicate A. baumannii isolates. Most of the MBL producers were isolated from sputa of patients with ventilation-associated pneumonia in ICU. PCR for amplifying blaLMP-4 and blavLM-2 for the 12 MBL-producing isolates failed. It demonstrates that MBLs produced by the isolates are MBLs other than IMP-4, VIM-2, VIM-3 and VIM-6.This study is the first report that MBLs are found in A. baumannii in China inland.