Assessing antimicrobial resistance profiles of in the pork production system.

is a significant enteric pathogen affecting human and livestock health. Pork production is a common source of contamination, with emerging multidrug resistance (MDR) posing a global health threat. contamination and antimicrobial resistance (AMR) profiles in the pig production chain are underreported. To investigate the prevalence of in the pig production chain and characterise their AMR profiles. We collected 485 samples from pig farms, a standard pig abattoir and retail markets in Patthalung and Songkhla provinces in southern Thailand. Antimicrobial susceptibility testing was performed on these samples, and AMR profiles were determined. was detected in 68.67% of farm samples, 45.95% of abattoir samples and 50.67% of retail market samples. Analysis of 264 isolates, representing 18 serotypes, identified serotype Rissen as the most prevalent. The predominant resistance phenotypes included ampicillin (AMP, 91.29%), tetracycline (TET, 88.26%) and streptomycin (STR, 84.47%). Over 80% of isolates showed resistance to three or more antimicrobial classes, indicating MDR. The AMP-STR-TET resistance pattern was found in nearly 70% of all MDR isolates across the production chain. The high prevalence of MDR is consistent with extensive antimicrobial use in the livestock sector. The presence of extensively resistant highlights the urgent need for antimicrobial stewardship. Strengthening preventive strategies and control measures is crucial to mitigate the risk of MDR spreading from farm to fork.