Volume 13, Number 5—May 2007
Research
International Spread of Multidrug-resistant Salmonella Schwarzengrund in Food Products
Frank M. Aarestrup*
, Rene S. Hendriksen*, Jana Lockett†, Katie Gay†, Kathryn Teates†‡, Patrick F. McDermott§, David G. White§, Henrik Hasman*, Gitte Sørensen*, Aroon Bangtrakulnonth¶, Srirat Pornreongwong¶, Chaiwat Pulsrikarn¶, Frederick J. Angulo†, and Peter Gerner-Smidt†#
, Rene S. Hendriksen*, Jana Lockett†, Katie Gay†, Kathryn Teates†‡, Patrick F. McDermott§, David G. White§, Henrik Hasman*, Gitte Sørensen*, Aroon Bangtrakulnonth¶, Srirat Pornreongwong¶, Chaiwat Pulsrikarn¶, Frederick J. Angulo†, and Peter Gerner-Smidt†#
Table
Origin and occurrence of resistance among Salmonella enterica serovar Schwarzengrund isolates from humans, food, and food animals in Denmark, Thailand, and the United States
| Country/source | No. isolates tested/ total no. isolates | No. isolates resistant to antimicrobial drugs* | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| AMP | CHL | CIP | GEN | NAL | STR | SUL | TET | |||
| Denmark | ||||||||||
| Humans | 14/14 | 8 | 3 | 1 | 6 | 8 | 11 | 9 | 8 | |
| Pigs on farm | 22/22 | 0 | 2 | 0 | 0 | 0 | 4 | 2 | 2 | |
| Pork | 4/4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| Chicken meat of unknown origin | 7/7 | 4 | 1 | 0 | 4 | 5 | 5 | 6 | 4 | |
| Imported chicken | 13/13 | 11 | 0 | 0 | 11 | 11 | 12 | 13 | 13 | |
| Imported turkey | 9/9 | 1 | 0 | 0 | 1 | 1 | 4 | 4 | 4 | |
| Others | 0/4 | – | – | – | – | – | – | – | – | |
| Thailand | ||||||||||
| Humans† | 46/57 | 30 | 13 | 10 | 27 | 42 | 45 | 41 | 35 | |
| Chicken meat | 44/48 | 23 | 16 | 2 | 28 | 39 | 39 | 36 | 23 | |
| Turkey meat | 2/4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | |
| United States | ||||||||||
| Humans | 38/390 | 13 | 08 | 16 | 4 | 17 | 4 | 20 | 22 | |
| Chicken meat | 0/3 | – | – | – | – | – | – | – | – | |
| Turkey on farm | 0/1 | – | – | – | – | – | – | – | – | |
| Pigs on farm | 2/2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | |
| Imported food | 3/3 | 1 | 2 | 1 | 2 | 3 | 2 | 3 | 3 | |
| Total | 204/581 | 91 | 45 | 30 | 83 | 126 | 126 | 135 | 115 | |
*AMP, ampicillin; CHL, chloramphenicol; CIP, ciprofloxacin; GEN, gentamicin; NAL, nalidixic acid; STR, streptomycin; SUL, sulfamethoxazole; TET, tetracycline.
†One human isolate from Thailand was resistant to ceftiofur.
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