Emergence of Klebsiella pneumoniae isolates producing inducible DHA-1 β-lactamase in a University Hospital in Taiwan

Jing Jou Yan, Wen Chien Ko, Yun Chih Jung, Chin Luan Chuang, Jiunn Jong Wu

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Ten nonrepetitive clinical isolates of Klebsiella pneumoniae exhibiting an unusual inducible β-lactam resistance phenotype were identified between January 1999 and September 2001 in a university hospital in Taiwan. In the presence of 2 μg of clavulanic acid, the isolates showed a one to four twofold concentration increase in the MICs of ceftazidime, cefotaxime, and aztreonam but remained susceptible to cefepime (MICs, ≤0.5 μg/ml) and imipenem (MICs, ≤0.5 μg/ml). PCR, sequence analysis, and isoelectric focusing revealed production by these isolates of TEM-1, SHV-11, and DHA-1, a plasmid-encoded inducible AmpC β-lactamase originally found in a Salmonella enterica serovar Enteritidis strain. Transfer of the resistance by conjugation experiments was not successful, but Southern hybridization showed that blaDHA-1 was located on 70-kb plasmids, suggesting that the blaDHA-1-containing plasmids in the K. pneumoniae isolates were non-self-transmissible. Five isolates were recovered from patients in two surgery wards and two intensive care units. Acquisition of the DHA-1 producers could be traced back to previous hospitalizations 1 to 5 months earlier for the other five patients. Six and seven patterns among the isolates were demonstrated by plasmid analysis and ribotyping, respectively, indicating that the spread of the DHA-1 producers was due to both horizontal transfer of blaDHA-1 and dissemination of endemic clones.

Original languageEnglish
Pages (from-to)3121-3126
Number of pages6
JournalJournal of Clinical Microbiology
Issue number9
Publication statusPublished - 2002 Sep

All Science Journal Classification (ASJC) codes

  • Microbiology (medical)

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