Volume 13, Number 3—March 2007
Research
Tandem Repeat Analysis for Surveillance of Human Salmonella Typhimurium Infections
Mia Torpdahl*
, Gitte Sørensen†, Bjørn-Arne Lindstedt‡, and Eva Møller Nielsen*
, Gitte Sørensen†, Bjørn-Arne Lindstedt‡, and Eva Møller Nielsen*Table 2
Clusters identified by MLVA typing that were investigated in the 2-y period, by typing of food and animal isolates and/or patient interviews
| Cluster no. and period | No. Danish isolates (no. Norwegian isolates) | Phage type/ PFGE type/ MLVA type | Resistance profile | Description of confirmed outbreaks |
|---|---|---|---|---|
| 1. Dec 03–Mar 04 | 16 | DT104/PFGE014/MLVA133 | Ampiclilin, sulfomethoxazole | Human cases from narrow geographic area. Isolate match from local slaughterhouse. |
| 2. Jun–Jul 04 | 21 (1) | DT12/PFGE022/MLVA052 | Sensitive | Human cases from narrow geographic area. Interviews indicated source from local butcher. |
| 3. Aug–Sep 04 | 25 (1) | DT12/PFGE022/MLVA056 | Sensitive | Human cases from narrow geographic area. |
| 4. Aug–Sep 04 | 28 | NT/PFGE047/MLVA059 | Ampicillin, streptomycin, tetracyline | Isolate match from slaughterhouse. |
| 5. Oct–Dec 04 | 9 | NT/PFGE099/MLVA005 | Ampicillin, sulfomethoxazole, streptomycin tetracycline | Isolate match from imported meat. |
| 6. Jan–Nov 2005 | 40 | DT120/PFGE006/MLVA109 | Sensitive | |
| 7. Apr–Aug 2005 | 15 | RDNC/PFGE019/MLVA219, MLVA167 | Sensitive | MLVA167 isolate match from pig herd and both MLVA167 and MLVA219 were isolated from meat from the same slaughterhouse. |
| 8. May–Aug 2005 | 26 | DT12/PFGE022/MLVA216 | Sensitive | Human cases from narrow geographic area. Isolate match from local slaughterhouse and from local pig herd. |
| 9. Jun–Jul 2005 | 12 | DT104/PFGE014/MLVA238 | MR | |
| 10. Jun–Oct 2005 | 30 (1) | DT104/PFGE205, PFGE215/MLVA253, MLVA350, MLVA351, MLVA352 | MR | Interviews indicated restaurant outbreak. Isolate match from imported beef served as carpaccio in restaurant. |
| 11. Jul–Aug 2005 | 9 | DT136/PFGE208/MLVA266 | Sensitive | |
| 12. Oct–Nov 2005 | 22 | DT193/PFGE084/MLVA301 | Ampicillin, sulfomethoxazole, streptomycin, tetracycline | Human cases from narrow geographic area. Interviews indicated local butcher, and several samples collected from butcher were positive for outbreak profile. |
| 13. Oct–Nov 2005 | 11 | DT104/PFGE014/MLVA203 | Sensitive | |
| 14. Oct–Nov 2005 | 7 | NT/PFGE074/MLVA435 | Ampicillin, sulfomethoxazole, streptomycin, tetracycline |
*MLVA, multiple-locus variable-number tandem repeat analysis; PFGE, pulsed-field gel electrophoresis.
