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Applied and Environmental Microbiology, November 2007, p. 6885-6890, Vol. 73, No. 21
0099-2240/07/$08.00+0     doi:10.1128/AEM.00972-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.

Detection of Salmonella spp. in Retail Raw Food Samples from Vietnam and Characterization of Their Antibiotic Resistance{triangledown}

Thi Thu Hao Van,1 George Moutafis,1 Taghrid Istivan,1 Linh Thuoc Tran,2 and Peter J. Coloe1*

Biotechnology and Environmental Biology, School of Applied Sciences, RMIT University, Bundoora West Campus, Bundoora, Melbourne, Victoria 3083, Australia,1 Faculty of Biology, University of Natural Sciences, VNU-HCMC, Ho Chi Minh City, Vietnam2

Received 30 April 2007/ Accepted 19 August 2007

A study was conducted to examine the levels of Salmonella spp. contamination in raw food samples, including chicken, beef, pork, and shellfish, from Vietnam and to determine their antibiotic resistance characteristics. A total of 180 samples were collected and examined for the presence of Salmonella spp., yielding 91 Salmonella isolates. Sixty-one percent of meat and 18% of shellfish samples were contaminated with Salmonella spp. Susceptibility of all isolates to a variety of antimicrobial agents was tested, and resistance to tetracycline, ampicillin/amoxicillin, nalidixic acid, sulfafurazole, and streptomycin was found in 40.7%, 22.0%, 18.7%, 16.5%, and 14.3% of the isolates, respectively. Resistance to enrofloxacin, trimethoprim, chloramphenicol, kanamycin, and gentamicin was also detected (8.8 to 2.2%). About half (50.5%) of the isolates were resistant to at least one antibiotic, and multiresistant Salmonella isolates, resistant to at least three different classes of antibiotics, were isolated from all food types. One isolate from chicken (serovar Albany) contained a variant of the Salmonella genomic island 1 antibiotic resistance gene cluster. The results show that antibiotic resistance in Salmonella spp. in raw food samples from Vietnam is significant.

* Corresponding author. Mailing address: School of Applied Sciences, RMIT University, Building 3, Level 1, Room 2, City Campus, Melbourne, Victoria 3001, Australia. Phone: 61 3 9925 3691. Fax: 61 3 9925 3747. E-mail: pcoloe{at}rmit.edu.au

{triangledown} Published ahead of print on 31 August 2007.

Applied and Environmental Microbiology, November 2007, p. 6885-6890, Vol. 73, No. 21
0099-2240/07/$08.00+0     doi:10.1128/AEM.00972-07
Copyright © 2007, American Society for Microbiology. All Rights Reserved.





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