; M catarrhalis; Acinetobacter spp.. Gram-negative bacteria are high resistance to a lot of antibiotics; only low resistance to 3rd - 4th generation Cephalosporin (Ceftazidim, Cefepim), Ticarcillin, Piperazin / Tazobactam, 3rd generation Quinolone (Levofloxacin) and Imipenem, Meropenem.