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CHARACTERIZATION OF QUINOLONE RESISTANCE IN SALMONELLA SPP. ISOLATES FROM FOOD PRODUCTS AND HUMAN SAMPLES IN BRAZIL
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Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Referência Nacional de Enteroinfecções Bacterianas. Rio de Janeiro, RJ. Brasil / Universidade Federal Rural do Rio de Janeiro. Instituto de Veterinária. Departamento de Microbiologia e Imunologia Veterinária. Laboratório de Bacteriologia. Seropédica, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Referência Nacional de Enteroinfecções Bacterianas. Rio de Janeiro, RJ. Brasil.
Universidade Federal Rural do Rio de Janeiro. Instituto de Veterinária. Departamento de Microbiologia e Imunologia Veterinária. Laboratório de Bacteriologia. Seropédica, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Referência Nacional de Enteroinfecções Bacterianas. Rio de Janeiro, RJ. Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Referência Nacional de Enteroinfecções Bacterianas. Rio de Janeiro, RJ. Brasil.
Universidade Federal Rural do Rio de Janeiro. Instituto de Veterinária. Departamento de Microbiologia e Imunologia Veterinária. Laboratório de Bacteriologia. Seropédica, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Referência Nacional de Enteroinfecções Bacterianas. Rio de Janeiro, RJ. Brasil.
Abstract
Non-typhoidal salmonellosis is an important zoonotic disease caused by Salmonella enterica. The aim of this study was to investigate the prevalence of plasmid-mediated quinolone resistance in Salmonella spp. and its association with fluoroquinolone susceptibility in Brazil. A total of 129 NTS isolates (samples from human origin, food from animal origin, environmental, and animal) grouped as from animal (n=62) and human (n=67) food were evaluated between 2009 and 2013. These isolates were investigated through serotyping, antimicrobial susceptibility testing, and the presence of plasmid-mediated quinolone resistance (PMQR) genes (qnr, aac(6')-Ib) and associated integron genes (integrase, and conserved integron region). Resistance to quinolones and/or fluoroquinolones, from first to third generations, was observed. Fifteen isolates were positive for the presence of qnr genes (8 qnrS, 6 qnrB, and 1 qnrD) and twenty three of aac(6')-Ib. The conserved integron region was detected in 67 isolates as variable regions, from ±600 to >1000pb. The spread of NTS involving PMQR carriers is of serious concern and should be carefully monitored.
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