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 Chiu
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.
