 Antimicrobial susceptibility testing will be carried out by broth microdilution as recommended by the CLSI 3, and categorical assignment will be carried out using the CLSI breakpoints 3. The following agents will be included: ertapenem, imipenem, meropenem, cefepime, ceftazidime, cefotaxime, piperacillintazobactam, amoxicillinclavulanate, ciprofloxacin, levofloxacin, gentamicin, amikacin. 