The aim of this study was monitoring of antibiotic resistance of Enterobacteriaceae genera isolated from rectal swabs of ducks during seven weeks. For the antibiotic susceptibility testing disk diffusion method was used. Enterobacteriaceae genera were tested against four antibiotics: ampicillin, tetracycline, streptomycin and chloramphenicol. For the detection and identification of each species, we used Chromogenic coliform agar, Triple Sugar Iron agar and biochemical test (ENTEROtest 24). The

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... ighest resistance was determined in isolates of Enterobacteriaceae genera to tetracycline (32.43%). To streptomycin and to ampicillin resistance reached 8.10% and to chloramphenicol 5.40%. From rectal swabs of ducks during seven weeks following species were isolated: Escherichia coli, Yersinia enterolytica, Enterobacter aerogenes, Citrobacter freundii and one non-enterobacteriaceae specie Pseudomonas aeruginosa. Each of this species were resistant to monitored antibiotics. Antibiotic resistant bacteria are a biological danger in relation to animal and human health.