Antibiotic susceptibility of 104 clinical isolates of Klebsiella pneumoniae. IMP, imipenem; ATM, aztreonam; GEN, gentamicin; AK, amikacin; KM, kanamycin; CAZ, ceftazidime; CTX, cefotaxime; FEP, cefepime, CIP, ciprofloxacin; NA, nalidixic acid; PIP, piperacillin; TZP, piperacillin/tazobactam