Gram negative bacterias which belong to Enterobacteriaceae family which is critically important as a matter of human health, are comperatively prevalent in nature and foods. Infections formed by bacterias resistant to antibiotics significantly cause mortality and economical losses. Sensitivities of gram-negative bacterias isolated from miscellaneous samples to sulbactam-ampicillin, trimethoprim-sulfamethoxazol and ticarcillin-clavulanic acid were analysed. In this study, Proteus is primary isolated microorganism with % 52,08. It was determined that Proteus types are proportionally 86,66 % sensitive to Trimethoprim-Sulfamethoxazol and 76 % resistant to Sulbactam-Ampicillin. Citrobacter is the secondary isolated microorganism (31,25%). It was...