Prevalence and antimicrobial resistance of and identified in a slaughterhouse in Argentina.

The aim of this study was to evaluate the percentage of ( and ) from samples collected at the slaughterhouse to describe the prevalence of resistance to selected antimicrobials, and to characterize the genetic determinants. In total, from 333 samples analyzed, 31% were positive for More positive samples were detected before the chiller (46%) than after the chiller (16%). (59%) was more prevalent than (41%). Antimicrobial resistance differences between and were found (p < 0.001). Multidrug resistance was found in 72% of isolates and 69% of isolates (p < 0.001). Most isolates (57%) had the three genes of the efflux pump. The gene and resistance-associated point mutations within both the and 23S rRNA genes were detected in 100% of isolates. On the other hand, only had more prevalence of the gene than (p < 0.001), and most of the isolates (70-80%) had the and point mutation. These results could contribute to knowledge about the status of thermotolerant resistant to antimicrobials isolated from food animals in Argentina and to develop an antimicrobial resistance surveillance system.