Usually susceptible to fluoroquinolones, TMP/SMX, and aminoglycosides which are appropriate targeted therapy options.
Susceptible to carbapenems.
Usually susceptible to aztreonam.
Using non-carbapenem beta-lactams (i.e. Piperacillin/tazobactam, Ceftriaxone) when reported as susceptible, is likely reasonable for simple infections requiring short duration.
Intrinsic resistance to ampicillin and lower generation cephalosporins.
With exposure to beta-lactams, induction or de-repression can occur and confer resistance to 3rd generation cephalosporins.