Volume 13, Number 10—October 2007
Dispatch
Multidrug-Resistant Salmonella Typhimurium, Pacific Northwest, United States
Margaret A. Davis*
, Thomas E. Besser*, Kaye Eckmann†, J. Kathryn MacDonald†, Donna Green†, Dale D. Hancock*, Katherine N.K. Baker*, Lorin D. Warnick‡, Yesim Soyer‡, Martin Wiedmann‡, and Douglas R. Call*
, Thomas E. Besser*, Kaye Eckmann†, J. Kathryn MacDonald†, Donna Green†, Dale D. Hancock*, Katherine N.K. Baker*, Lorin D. Warnick‡, Yesim Soyer‡, Martin Wiedmann‡, and Douglas R. Call*
Table 1
Trends in resistance of bovine-origin Salmonella S. Typhimurium PFGE types TYP035 and TYP187*
| Resistance characteristics† | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 |
|---|---|---|---|---|---|---|
| TYP035 | ||||||
| ASu | 1 | 1 | 1 | |||
| ACaz | 1 | |||||
| AKSuT | 1 | 1 | ||||
| AKSSuT | 7 | 7 | 1 | 4 | 1 | 4 |
| ACKSSuT | 1 | 1 | ||||
| AKSSuTCaz | 3 | |||||
| AKSxtSSuT | 1 | |||||
| ACKSSuTCaz | 2 | 2 | ||||
| ACKSxtSSuT | 1 | |||||
| AKSuTCaz | 1 | |||||
| AKSSuTCaz | 1 | 1 | ||||
| ACKSSuTCaz | 2 | 1 | ||||
| ACKSxtSSuTCaz | 1 | 1 | 6 | 4 | ||
| AGKSxtSSuTCaz |
1 |
|||||
| Total |
8 |
10 |
5 |
17 |
12 |
8 |
| TYP187 | ||||||
| ACSSuTCaz | 1 | |||||
| AKSSuTCaz | 1 | 12 | ||||
| AKSuTCaz |
1 |
|||||
| Total | 1 | 2 | 12 |
*PFGE, pulsed-field gel electrophoresis.
†A, ampicillin; Su, triple-sulfa; Caz, ceftazidime; K, kanamycin; T, tetracycline; S, streptomycin; C, chloramphenicol; Sxt, trimethoprim-sulfamethoxazole; G, gentamicin. In April 2005 nitrofurantoin, trimethoprim, and ciprofloxacin were dropped from the panel, and amoxicillin-clavulanic acid, nalidixic acid, and ceftazidime-clavulanic acid were added.
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