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Background & objectives: Salmonellosis is an important zoonotic disease in worldwide that causes food-borne disease, gastroenteritis, enteric fever and bacteremia in humans. The purpose of this study was to determine the prevalence of salmonella common serotypes in broiler flocks of Ardabil province and their antibiotics resistance rate to five antibacterial agents widely used in the Iranian medical field. Methods: One-hundred and eighty nine samples including 70 liver, 70 heart and 49 intestine were collected for identification of salmonella. After microbial culture and isolation, serotyping with O monovalent and H monovalent antisera was performed. The antibiotic resistance rate of isolates was determined by disc diffusion test. Results: 7.93% samples were positive to Salmonella spp. The most common serotypes isolated from positive samples were Salmonella enteritidis (86.6%), Salmonella typhimurium (6.7%) and Salmonella thompson (6.7%), respectively. The highest isolation of Salmonella was observed in liver (40.0%), then in intestine (33.4%) and heart (26.6%). In view of salmonella contamination in different seasons, the highest rate of prevalance was in winter (p<0.05). All isolates were resistant to tetracycline. The highest resistance was to cotrimoxazole (53.3%), amoxicillin (33.3%) and ciprofloxacin (13.3%). No salmonella isolates were resistant to ceftriaxone. Conclusion: The results of this study show the dominant serotype was Salmonella entritidis and the high frequency of resistance to the three drugs tetracycline, cotrimoxazole and amoxicillin widely used in the Iranian medical field. These findings are important for public health.

majallah-i salāmat va bihdāsht-i ardabīl

A Survey on Prevalence of Salmonella enteritidis and Salmonella typhimurium Serotypes in Broiler Flocks of Ardabil Province and Determination of Their Antibiotics Resistance to Five Antibacterial Agents Widely Used in the Iranian Medical Field