Characterization of extended spectrum beta-lactamase-producing Klebsiella pneumoniae from Beijing, China.
Fourteen clinical isolates of Klebsiella pneumoniae with extended-spectrum beta-lactamases (ESBLs) were detected by the double disk synergy test and the Etest ESBL strip. Co-resistances included high MICs for aminoglycosides, fluoroquinolones, tetracyclines, and trimethoprim/sulphamethoxazole. Co-resistance was not observed in five of the 14 strains. These isolates were all genetically distinct as determined by the automated ribotyping method. Isoelectric focusing documented the presence of multiple beta-lactamases (one to four per isolate) with pIs ranging from 5.4 to 8.4. The majority of isolates contained beta-lactamases with pI values of 7.6 and 8.4 consistent with SHV-type ESBLs and an Amp C enzyme, respectively. Emerging ESBL strains in K. pneumoniae compromise the use of agents such as cefotaxime, ceftriaxone, ceftazidime in China; leading to the expansion of quality infection control practices and formulary management programmes to minimize clonal expansion.
Shen
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Department of Microbiology 301 Hospital 28, FuXing Road, Beijing 100853, People's Republic of China. dingxiashen@hotmail.com
Winokur
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Jones
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D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D002681:China; D024881:Drug Resistance, Bacterial; D024901:Drug Resistance, Multiple, Bacterial; D006801:Humans; D007525:Isoelectric Focusing; D007710:Klebsiella Infections / Q000382:microbiology; D007711:Klebsiella pneumoniae / Q000145:classification* / Q000187:drug effects* / Q000201:enzymology; D008826:Microbial Sensitivity Tests / Q000379:methods; D021521:Ribotyping; D001618:beta-Lactamases / Q000378:metabolism*; D047090:beta-Lactams
D000900:Anti-Bacterial Agents; D047090:beta-Lactams; D001618:beta-Lactamases