General Susceptibility

Usually susceptible to:

  • Cephalosporins including first generation,

  • Aminoglycosides,

  • TMP-SMX,

  • Fluoroquinolones

  • Pip-Tazo.

Almost always susceptible to:

  • Carbapenems

  • Aztreonam

  • Tigecycline

  • Colistin

Intrinsically resistant to ampicillin.

May be resistant to third generation cephalosporins (ESBLs), and rarely to carbapenems (carbapenemase enzymes).

Use fosfomycin and nitrofurantoin for UTI only, when confirmed susceptible.