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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.

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