Investigation of antibiotic resistance in Salmonella infantis isolated from poultry in Arak

Salmonellosis is a common disease among human, animal and poultry which is raised as a food-borne illness. One of the most common serotypes of this bacterium is salmonella infantis. The aim of this study was to investigate the antimicrobial resistance of 70 salmonella infantis isolates from poultry between 1389-1390 in Arak. In order to confirm the genus of Salmonella, all isolates showed 1.5 Kb band on agarose gel. The results of antibiogram that was performed by the Kirby-Bauer disk diffusion method according to Clinical Laboratory Standards Institute (CLSI) showed that all isolates (100%) were resistant to nalidixic acid and nitrofurantoin. Among 70 isolates, 2 (2.9%) cases were resistant to 11 antibiotic followed by 10 (14.3%) to 10 antibiotic, 8 (11.4%) to 9 antibiotic, 6 (8.6%) to 8 antibiotic, 22(31.4%) to 7 antibiotic, 12(17.1%) to 6 antibiotic and 8(11.4%) to 5 antibiotic. Also twenty-nine antibiotic resistance patterns were found.