In this study, frequency of antibiotic resistance was investigated in A. hydrophila from hospital effluent water in Turkey. A total of 70 A. hydrophila strains were isolated. The resistance of A. hydrophila isolates to 10 different antibiotics was investigated by agar diffusion method. Results showed that a high incidence of resistance to ampicillin (100.0%), tetracycline (100.0%) and nalidixic acid (87.1%), and a low incidence of resistance to amikacin (15.7%). In the other hand, all isolates found sensitive to nitrofurantoin. Multiple antibiotic resistance (MAR) index values ranging from 0.2 to 0.9. This study suggest that multiple antibiotic resistant A. hydrophila strains easilly recovered from hospital effluent waters in Turkey and these sewages may play as an important reservoirs responsible for infectious diseases pathogen A. hydrophila. At the same time, these bacteria may result in a potential ecological effect.

Keywords: Aeromonas hydrophila, MAR index, Hospital sewage.