SEROTYPING AND ANTIBIOTIC RESISTANCE PATTERNS OF ISOLATED SALMONELLA FROM ANIMAL FEED IN ARDABIL, NORTHWEST OF IRAN

Background and Aim:Salmonellosis is one of the most important zoonotic diseases. Antimicrobial therapy is an important tool in reducing Salmonella infections, but the indiscriminate use of antibiotics in poultry farms can lead to the emergence of resistance and inefficacy of antimicrobials. The purpose of this study was to investigate the prevalence of Salmonella serogroups in animal feed of Ardabil, northwest of IranMethods:Fifty animal feed were collected from different farms between January and March 2018. Salmonella spp were identified. After microbial culture and isolation, serotyping with commercial antiserum was performed. The Antibiotic resistance rate of isolates was determined by Kirby Bauer disc diffusion methodResults:8 % animal feed samples were positive to Salmonella spp. The Salmonella isolates belonged to serogroups D (50 %), C (25 %) and Unknown (25 %). Isolates D and C were resistant to tetracycline. The highest resistance was to cloramfenicol (66.6%), ampicillin (66.6%), Sulfadiazin + trimethoprim (66.6%), amikacin (66.6%) and cotrimoxazole (66.6%). The lowest levels of resistance were for doxycycline (33.3%), florfenicol (33.3%) and ciprofloxacin (33.3%). All isolates were sensitive to enrofloxacin.Conclusion:The high prevalence of resistant salmonellae among animal feed indicates that the administration of antimicrobial drugs has to be made with more caution.

کلیدواژه ها:

Animal feed ، Salmonella ، Antibiotics resistance ، Ardabil