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J Med Microbiol 55 (2006), 1245-1250; DOI: 10.1099/jmm.0.46637-0
© 2006 Society for General Microbiology
ISSN 1473-5644

CTX-M-producing Salmonella spp. in Hong Kong: an emerging problem

Yujuan Jin and J. M. Ling

Department of Microbiology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, New Territories, Hong Kong SAR, China

Correspondence
J. M. Ling
meilunling{at}cuhk.edu.hk

Received 21 March 2006
Accepted 29 May 2006

Two Salmonella enterica serovar Typhimurium isolates and one S. enterica serovar Enteritidis isolate that were resistant to 4 µg cefotaxime ml–1 and produced CTX-M-type extended-spectrum ß-lactamases (ESBLs) were characterized from patients in Hong Kong during 2003–2004. The S. Typhimurium strain isolated in 2003 produced a CTX-M-9 ESBL and harboured a blaCTX-M-9 gene that was associated with a class I integron-containing gene cassette and orf513 similar to those of In60. The second S. Typhimurium strain and the S. Enteritidis strain, both isolated in 2004, produced CTX-M-14; the former also produced TEM-1. The blaCTX-M-14 gene in these two isolates was associated with the insertion sequence ISEcp1. The CTX-M genes were present on a transferable plasmid of 62, 70 or 92 kb. PFGE of XbaI-restricted total DNA from the two S. Typhimurium isolates indicated that they were not clonally related. These three isolates were also resistant to one of the other non-ß-lactam antimicrobial agents tested. This is the first report of a CTX-M-9 ESBL in Salmonella in Hong Kong and the presence of blaCTX-M-9 and blaCTX-M-14 in S. Typhimurium.

Abbreviations: ESBL, extended-spectrum ß-lactamase.




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