Cluster analysis of PFGE profiles for 97 K. pneumoniae strains used in this study. aBronchoscopic aspirates (BBA). bCefoperazone (CFP), aztreonam (ATM), amikacin (AMK), sulbactam cefoperazone (SCF), meropenem (MEM), cefixime (CFM), amoxicillin-clavulanate (AMC), ciprofloxacin (CIP), ampicillin (Amp), tazobactam (TZP), imipenem (IMP), ceftazidime (CAZ), colistin (CT), cefotaxime (CTX), gentamycin (GEN), and tetracycline (TET). cFemale (F) or male (M)