Polymyxin B treatment exhibits variations in persister formation rates in A. baumannii. Persister survival rates, resistance phenotypes, and polymyxin B MICs of 22 clinical isolates of A. baumannii used in this study are shown. MEMR, meropenem resistance; AMKR, amikacin resistance; CIPR, ciprofloxacin resistance; STRR, streptomycin resistance; TETR, tetracycline resistance; RIFR, rifampicin resistance.