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Volume 17, Number 6—June 2011

Dispatch

Increasing Ceftriaxone Resistance in Salmonellae, Taiwan

Lin-Hui Su, Wen-Shin Teng, Chyi-Liang Chen, Hao-Yuan Lee, Hsin-Chieh Li, Tsu-Lan Wu, and Cheng-Hsun ChiuComments to Author 
Author affiliations: Author affiliations: Chang Gung Memorial Hospital, Taoyuan, Taiwan (L.-H. Su, H.-C. Li, T.-L. Wu); Chang Gung University College of Medicine, Taoyuan (L.-H. Su, W.-S. Teng, H.-Y. Lee, T.-L. Wu, C.-H. Chiu); Chang Gung Children’s Hospital, Taoyuan (W.-S. Teng, C.-L. Chen, H.-Y. Lee, C.-H. Chiu)

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Table 2

Characteristics of conjugative blaCMY-2-harboring IncI1 plasmids derived in this study and comparison of pMLST patterns with similar plasmids published previously*

IncI1 plasmid
Salmonella enterica serotype or Escherichia coli
Susceptibility profile†
Country
Year of isolation
pMLST‡ ST§
Clonal complex
Reference
repI1
ardA
trbA
sogS
pilL
pSC-B134 Choleraesuis R/S/S Taiwan 2007 1 1 15 9 3 51 NA This study
pSC-B136 Choleraesuis R/R/S Taiwan 2008 1 4 15 11 2 52 NA This study
pSB-5 Typhimurium
variant Copenhagen R/R/R Taiwan 2010 2 1 15 11 2 53 NA This study
pSB28 Typhimurium S/S/S Taiwan 2010 1 4 5 11 2 54 NA This study
pSB151 Typhimurium S/S/S Taiwan 2010 4 5 15 11 3 55 NA This study
pSB193 Typhimurium S/S/S Taiwan 2010 1 4 5 11 2 54 NA This study
pSB105 Agona R/S/S Taiwan 2010 2 1 15 11 3 56 NA This study
pSD166 Enteritidis R/S/S Taiwan 2010 2 1 15 11 3 56 NA This study
398T E. coli NA Italy 2006 1 2 3 2 1 2 CC-2 (12)
05–1909 Heidelberg NA Canada 2005 1 2 3 2 1 2 CC-2 (13)
1358T Thompson NA USA 1996 1 3 3 4 1 4 CC-12 (12)
DH-20406 Heidelberg NA USA 2004 1 4 3 4 1 12 CC-12 (14)
06–3048 4,5,12:i:– NA Canada 2006 1 4 3 4 1 12 CC-12 (13)
06–3539 Agona NA Canada 2006 1 4 3 4 1 12 CC-12 (13)
N07–0084 E. coli NA Canada 2005 1 4 3 4 1 12 CC-12 (13)
05–2835 Heidelberg NA Canada 2005 1 4 3 4 1 12 CC-12 (13)
06–3985 Litchfield NA Canada 2006 1 4 3 4 1 12 CC-12 (13)
05–5567 Typhimurium NA Canada 2005 1 4 3 4 1 12 CC-12 (13)
N06–523 E. coli NA Canada 2006 1 4 3 2 1 18 CC-2/ CC-12 (13)
N06–0537 E. coli NA Canada 2006 1 3 3 4 3 19 CC-12 (13)
05–6117 4,5,12:1:– NA Canada 2006 1 1 3 9 1 20 NA (13)
N07–0093 E. coli NA Canada 2005 1 1 3 9 1 20 NA (13)
06–0753 Heidelberg NA Canada 2006 1 2 11 3 3 21 CC-5 (13)
N07–0079 E. coli NA Canada 2005 1 6 3 4 1 22 CC-12 (13)
N07–0081 E. coli NA Canada 2005 1 2 3 1 1 23 CC-2 (13)

*pMLST, plasmid multilocus sequence typing; ST, sequence type; R, resistant; S, susceptible; NA, not applicable.
†Antimicrobial drug susceptibility to chloramphenicol, trimethoprim/sulfamethoxazole, and quinolones (nalidixic acid and ciprofloxacin). The transconjugants were also resistant to ampicillin and ceftriaxone.
‡pMLST results were compared to those published in the plasmid MLST website (http://pubmlst.org/plasmid).
§STs were designated according to the different combinations of allele variants observed among the IncI1 plasmids.

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