Citrobacter freundii
General Susceptibility

General Susceptibility

  • Cefepime
  • Meropenem
  • Moderate-to-High expresser of inducible AmpC which can cause failure of penicillins, beta-lactam/beta-lactamase inhibitors, 1st-3rd generation cephalosporins, aztreonam, and ertapenem, despite in vitro susceptibility

Intrinsic resistance:

  • Ampicillin
  • Amoxicillin/clavulanate
  • Ampicillin/sulbactam
  • 1st & 2nd gen cephs (Cefazolin, Cephalothin, Cefuroxime)
  • Cephamycins (Cefoxitin, Cefotetan)