Antimicrobial susceptibility profile of Enterococcus species isolated from cows with clinical mastitis and from bulk milk tanks in Brazil

Vancomycin-resistant enterococci (VRE) have been reported as a major hazard to human and animal health, causing problems like clinical mastitis in dairy cattle nosocomial infections humans. The aim of this study was determine the vitro microbial susceptibility profile isolated from farms São Paulo Minas Gerais states, Brazil. A total 310 samples Enterococcus species bovine (52) bulk tanks (258) were analyzed. sensibility studied by disk diffusion method, isolates intermediately resistant vancomycin submitted minimum inhibitory concentration (MIC) test. also classified according their multiresistance profile. All sensitive vancomycin. Most cephalexin (93.8%), novobiocin (98.8%), cefoxitin (91.9%) oxacillin (91.9%), while those presented high resistance trimethoprim/sulfamethoxazole (84.7%), (100%), (88.5%) (80.8%). (VSE). prevalence multiple antimicrobials emphasizes risks existing use ineffective antibiotics.   Key words: Enterococci, mastitis, multiresistence, milk,