Antimicrobial Resistance of Salmonella Serovars Isolated from Beef at Retail Markets in the North Vietnam

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概要

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• Approximately 39.9% (63/158) of beef samples collected from retail markets in Hanoi from January to June 2009 were Salmonella-positive. Nine Salmonella serovars, Anatum (28.6%), Rissen (25.4%), Weltevreden (12.7%), Typhimurium (7.9%), Derby (7.9%), Lexington (7.9%), Dublin (4.6%), Newport (3.2%) and London (1.8%), were identified. Thirty-seven (58.7%) of the 63 Salmonella isolates were resistant to at least one antimicrobial tested, of which 29 (46%) isolates showed multidrug resistance (MDR). The isolates were commonly resistant to tetracycline (46.0%), sulphonamide (39.7%), ampicilline (31.7%), streptomycin (30.2%), trimethoprim (28.6%), kanamycin (28.6%) and chloramphenicol (22.2%). Fourteen (blaTEMV, blaOXA-1, aadA1, aadA2, sul1, tetA, tetB, tetG, cmlA1, floR, dfrA1, dfrA12, aac (3)-IV and aphA1-1AB) out of 22 antimicrobial resistance genes were detected by PCR from the resistant isolates. The catA1, Kn, blaPSE-1 genes and plasmid-mediated quinolones resistance (PMQR) genes such as qnrA, qnrB, qnrS, qepA and acc (6’)-ib-cr were not detected. Mutations in the gyrA gene leading to the amino acid changes Ser83Phe and/or Asp87Asn were found in 6 out of the 11 quinolone-resistant isolates. The data revealed that multidrug resistant Salmonella strains were widely distributed in north Vietnam via the food chain and might contain multiple genes specifying identical resistant phenotypes. Thus, continuous studies are necessary to clarify the mechanisms of MDR in Salmonella and its spread in the livestock market.

• 日本獣医学会の論文

著者

• Pham Thi

  Department Of Bioprocess Engineering Chonbuk National University

• Shimada Akinori

  Department Of Comparative Pathology Faculty Of Veterinary Medicine Hokkaido University

• Hirai Takuya

  Department Of Veterinary Pathology Faculty Of Agriculture University Of Miyazaki

• Lan Nguyen

  Department Of Microbiology And Immunology Pasteur Institute Ho Chi Minh City

• Yamaguchi Ryoji

  Department Of Material System Engineering Faculty Of Technology Tokyo University Of Agriculture And Technology

• THAI Truong

  Department of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki,Miyazaki 889–2192, Japan

• NGOC Pham

  Department of Veterinary Hygiene, National of Institute Veterinary Research, Truong Chinh, Dong Da, Ha Noi, Vietnam

• LAN Nguyen

  Department of Microbiology—Infectious diseases—Pathology, Faculty of Veterinary Medicine, Hanoi University of Agriculture

• PHAM Thi

  Department of Veterinary Hygiene, National of Institute Veterinary Research

• THAI Truong

  Department of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki

• YAMAGUCHI Ryoji

  Department of Veterinary Pathology, Faculty of Agriculture, University of Miyazaki

• SHIMADA Akinori

  Department of Veterinary Pathology, Faculty of Agriculture, Tottori University

• LAN Nguyen

  Department of Microbiology - Infectious Diseases - Pathology, Faculty of Veterinary Medicine, Hanoi University of Agriculture, Trau Quy, Gia Lam, Ha Noi, Vietnam

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