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Mechanisms of Resistance

Three Cefotaximases, CTX-M-9, CTX-M-13, and CTX-M-14, among Enterobacteriaceae in the People's Republic of China

Aroonwadee Chanawong, Fatima Hannachi M'Zali, John Heritage, Jian-Hui Xiong, Peter Michael Hawkey
Aroonwadee Chanawong
1Division of Microbiology, University of Leeds, Leeds LS2 9JT
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Fatima Hannachi M'Zali
1Division of Microbiology, University of Leeds, Leeds LS2 9JT
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John Heritage
1Division of Microbiology, University of Leeds, Leeds LS2 9JT
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Jian-Hui Xiong
2Department of Immunity and Infection, The Medical School, University of Birmingham, Birmingham B15 2TT, United Kingdom
3First Municipal People's Hospital of Guangzhou, Guangzhou 510180, People's Republic of China
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Peter Michael Hawkey
1Division of Microbiology, University of Leeds, Leeds LS2 9JT
2Department of Immunity and Infection, The Medical School, University of Birmingham, Birmingham B15 2TT, United Kingdom
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  • For correspondence: HawkeyP@heartsol.wmids.nhs.uk
DOI: 10.1128/AAC.46.3.630-637.2002
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ABSTRACT

Of 15 extended-spectrum β-lactamase (ESBL)-producing isolates of the family Enterobacteriaceae collected from the First Municipal People's Hospital of Guangzhou, in the southern part of the People's Republic of China, 9 were found to produce CTX-M ESBLs, 3 produced SHV-12, and 3 produced both CTX-M and SHV-12. Eleven isolates produced either TEM-1B or SHV-11, in addition to an ESBL. Nucleotide sequence analysis of the 12 isolates carrying blaCTX-M genes revealed that they harbored three different blaCTX-M genes, blaCTX-M-9 (5 isolates), blaCTX-M-13 (1 isolate), and blaCTX-M-14 (6 isolates). These genes have 98% nucleotide homology with blaToho-2. The blaCTX-M genes were carried on plasmids that ranged in size from 35 to 150 kb. Plasmid fingerprints and pulsed-field gel electrophoresis showed the dissemination of the blaCTX-M genes through transfer of different antibiotic resistance plasmids to different bacteria, suggesting that these resistance determinants are highly mobile. Insertion sequence ISEcp1, found on the upstream region of these genes, may be involved in the translocation of the blaCTX-M genes. This is the first report of the occurrence of SHV-12 and CTX-M ESBLs in China. The presence of strains with these ESBLs shows both the evolution of blaCTX-M genes and their dissemination among at least three species of the family Enterobacteriaceae, Escherichia coli, Klebsiella pneumoniae, and Enterobacter cloacae, isolated within a single hospital. The predominance of CTX-M type enzymes seen in this area of China appears to be similar to that seen in South America but is different from those seen in Europe and North America, suggesting different evolutionary routes and selective pressures. A more comprehensive survey of the ESBL types from China is urgently needed.

  • Copyright © 2002 American Society for Microbiology
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Three Cefotaximases, CTX-M-9, CTX-M-13, and CTX-M-14, among Enterobacteriaceae in the People's Republic of China
Aroonwadee Chanawong, Fatima Hannachi M'Zali, John Heritage, Jian-Hui Xiong, Peter Michael Hawkey
Antimicrobial Agents and Chemotherapy Mar 2002, 46 (3) 630-637; DOI: 10.1128/AAC.46.3.630-637.2002

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Three Cefotaximases, CTX-M-9, CTX-M-13, and CTX-M-14, among Enterobacteriaceae in the People's Republic of China
Aroonwadee Chanawong, Fatima Hannachi M'Zali, John Heritage, Jian-Hui Xiong, Peter Michael Hawkey
Antimicrobial Agents and Chemotherapy Mar 2002, 46 (3) 630-637; DOI: 10.1128/AAC.46.3.630-637.2002
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KEYWORDS

Enterobacteriaceae
Escherichia coli Proteins
beta-lactamases

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