CHARACTERIZATION OF ANTIMICROBIAL RESISTANCE IN ENTEROCOCCI OF ANIMALORIGIN

Among 97 enterococci cultured from animals, gentamicin MICs were great er than or equal to 2,000 mu g/ml for 9 isolates and between 250 and 1 ,024 mu g/ml for 6 isolates. For two isolates tested (gentamicin MICs, 256 and 512 mu g/ml, respectively), there was no in vitro synergy wit h penicillin plus gentamicin, resistance was transferable, and there w as no hybridization with a probe specific for 6'-aminoglycoside acetyl transferase-2 ''-aminoglycoside phosphotransferase. The results of the study indicate the presence of a unique gentamicin resistance genotyp e in enterococci of animal origin.