PFGE and bacterial OMP profiles of A. baumannii isolates. (A) Lanes: M, lambda ladder; 1 and 2, cefepime-resistant and -susceptible A. baumannii 008 isolates; 3 and 4, cefepime-resistant and -susceptible A. baumannii 328 isolates. (B) Lanes: M, protein molecular mass marker; 1, A. baumannii ATCC 19606; 2 and 3, cefepime-resistant and -susceptible A. baumannii 008 isolates; 4 and 5, cefepime-resistant and -susceptible A. baumannii 328 isolates.