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Open Access Research article

Characterization of 13 multi-drug resistant Salmonella serovars from different broiler chickens associated with those of human isolates

Lan-Ho Chiu1, Cheng-Hsun Chiu23, Yan-Ming Horn4, Chien-Shun Chiou5, Chien-Yu Lee1, Chia-Ming Yeh4, Chang-You Yu6, Chean-Ping Wu4, Chao-Chin Chang7 and Chishih Chu8*

Author Affiliations

1 Animal Disease Control Center Chiayi County, Taibao 1st Rd., Taibao City, Chiayi County 612, Taiwan

2 Department of Pediatrics, Chang Gung Children's Hospital, 5 Fu-Hsing Street, Kuei-Shan Hsiang, 33375, Taoyuan, Taiwan

3 Department of Medicine, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, 33302, Taiwan

4 Department of Animal Science, National Chiayi University, No 300, University Rd, Chiayi, 60004, Taiwan

5 The Central Region Laboratory, Center of Research and Diagnostics, Centers for Disease Control, No 30, Wenxin S 3rd Rd, Nantun Dist, Taichung, 40856, Taiwan

6 Department of Veterinary Medicine, National Chiayi University, No 300, University Rd, Chiayi, 60004, Taiwan

7 Graduate Institute of Veterinary Public Health, School of Veterinary Medicine, National Chung Hsing University, 250, Kuo Kuang Road, Taichung 40200, Taiwan

8 Department of Microbiology and Immunology, National Chiayi University, No 300, University Rd, Chiayi, 60004, Taiwan

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BMC Microbiology 2010, 10:86  doi:10.1186/1471-2180-10-86

Published: 23 March 2010

Abstract

Background

Salmonella are frequently isolated from chickens and their products. Prevalent serogroups and serovars of Salmonella as well as their genotypes and antibiograms were determined for cloacal samples from 1595 chickens. To understand the possible serovar and H antigens for transmission between chicken and human, serovars and their H antigens of 164 chicken and 5314 human isolates were compared.

Results

Prevalence of Salmonella differed among chicken lines and ages. Chicken and human isolates belonged mainly to serogroup B, C1, C2-C3, D, and E. 13 serovars and 66 serovars were identified for chicken and human isolates respectively. The common serovars for chicken and human isolates were S. Typhimurium, S. Enteritidis, S. Albany, S. Derby, and S. Anatum and shared common H1 antigens "g complex; i; e,h; and z4,z24" and H2 antigens "1 complex and -". In human isolates, H1 antigen "i" and H2 antigen "-" were common in all serogroups. In chicken, antimicrobial susceptibility differed among serogroups, serovars and three counties. All isolates were susceptible to cefazolin and ceftriaxone, but highly resistant to ampicillin, chloramphenicol, flumequine, streptomycin, sulfamethoxazole-trimethoprim, and tetracycline. Except those isolates of serogroup C1 of Chick group and serogroup G, all isolates were multi-drug resistance. Only S. Kubacha, S. Typhimurium, S. Grampian, and S. Mons were resistant to ciprofloxacin and/or enrofloxacin.

Conclusion

In chicken, prevalent serogroups and serovars were associated with chicken ages, lines and regions; and flouroquinolone-resistant and MDR isolates emerged. H1 antigens "g complex and i" and H2 antigens "1 complex and -" might be important for transmission of Salmonella between chicken and human.