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Volume 13, Number 5—May 2007

Research

International Spread of Multidrug-resistant Salmonella Schwarzengrund in Food Products

Frank M. Aarestrup*Comments to Author , 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†#
Author affiliations: *Danish Institute for Food and Veterinary Research, Copenhagen, Denmark;; †Centers for Disease Control and Prevention, Atlanta, Georgia, USA; ‡Atlanta Research and Education Foundation, Atlanta, Georgia, USA; §US Food and Drug Administration, Laurel, Maryland, USA; ¶Ministry of Public Health, Bangkok , Thailand; #Statens Serum Institut, Copenhagen, Denmark;

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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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