Restricted accessResearch articleFirst published online 2022-10
Antibiotic Resistance Profiles and Molecular Characteristics of bla CTX-M-15 -Carrying Salmonella enterica Serovar Enteritidis Isolates from Healthy and Diseased Chickens in Korea
Extended-spectrum β-lactamase (ESBL)-producing Salmonella enterica serovar Enteritidis has emerged as a public health concern. The main objectives of this study were therefore to determine the antimicrobial susceptibility profiles of Salmonella Enteritidis and to investigate the molecular characteristics of identified ESBL-producing isolates. In the study, 237 Salmonella Enteritidis isolates (232 isolates from chickens, 4 from cattle, and 1 from a pig) were recovered from carcasses and fecal samples of healthy and diseased food animals between 2010 and 2017. Ceftiofur resistance was noted only in chicken isolates (43%, 102/237), with the highest in healthy chickens and their carcasses (48.3%, 83/172) compared with that in diseased chickens (31.7%, 19/60). All of the ceftiofur-resistant isolates exhibited resistance to multiple antimicrobials. Indeed, a relatively higher percentage of ceftiofur-resistant isolates demonstrated resistance to the tested aminoglycosides and tetracycline compared with the ceftiofur-susceptible strains. In this study, blaCTX-M-15 was the only ESBL gene detected in all of the ceftiofur-resistant isolates. The blaCTX-M-15-carrying isolates belonged to 11 different pulsotypes. The blaCTX-M-15 gene was transferred from 20.6% (21/102) of the blaCTX-M-15-harboring isolates to a recipient Escherichia coli J53. The coexistence of IncHI2/ST2 and IncFIIs/ST1 plasmids was noted in the majority (81.8%, 18/22) of the transconjugants. E. coli J53 transconjugants carrying blaCTX-M-15 gene showed distinct genetic environments, predominantly ISEcp1-blaCTX-M-15-orf477 (15/21, 71.4%). This study demonstrated that healthy chickens and their carcasses act as reservoirs of blaCTX-M-15-carrying Salmonella Enteritidis that can potentially be transmitted to humans.
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