Secular change of carbapenem-resistant Acinetobacter baumannii (CRAB) carrying specific carbapenemase genes recovered from different regions of Taiwan from 2002 to 2010 (a) and their susceptibility to antibiotics (b). Isolates carrying multiple carbapenemase genes were counted more than once. OXA-51, CRAB isolates with ISAba1-blaOXA-51-like; OXA-23, CRAB isolates with blaOXA-23-like, and OXA-24, CRAB isolates with blaOXA-24-like. IMP, imipenem; MEM, meropenem; CAZ, ceftazidime; FEP, cefepime; TZP, piperacillin-tazobactam; AMS, ampicillin-sulbactam; AMK, amikacin; LEV, levofloxacin; POL, polymyxin B.