Serotype Distribution and Antimicrobial Resistance of Salmonella Isolates in Seoul, 2020-2022

Salmonella enterica is the most representative water and foodborne diseasepathogen in Korea and worldwide. This study investigated the serotype distributionand antimicrobial resistance of Salmonella isolated in Seoul between 2020 and2022. A total of 494 Salmonella strains were isolated in three years. The identifiedSalmonella strains showed 61 serotypes, the most common being Enteritids 138(27.9%), followed by I 4,[5],12:i:- 61 (12.3%), Typhimurium 57 (11.5.%), Infantis50 (10.1%), and Bareilly 27 (5.5%), which accounted for 67.4% of the totalserotypes. As a result of antimicrobial susceptibility test of Salmonella, theantimicrobials with high resistance rates were nalidixic acid (36%), ampicillin(33.2%), ampicillin/sulbactam (28.5%), tetracycline (26.1%). Characteristically,the antimicrobial resistance patterns were different for each serotypes, and I4,[5],12:i:- had the highest antimicrobial resistance rate among the majorserotypes. In addition, the pattern of antimicrobial multidrug resistance (MDR)showed a clear difference in serotypes. Serotype I 4,[5],12:i:- demonstrated thehighest MDR rate (77. 0%), and showed the most diverse types of resistance. Inconclusion, the characteristic of Salmonella isolated from Seoul during 2020-2022 is that various serotypes have been identified every year, and the proportionof Salmonella I 4,[5],12:i:- with high antimicrobial resistance is increasing comparedto Salmonella Typhimurim. KCI Citation Count: 0