Hi ckscoville, I was curious about your particular organism, so I looked it up. I thought this tidbit about antibiotics might be useful for you. It is usually resistant to a variety of antibiotics including penicillins, ; cephalosporins, quinolones, and aminoglycosides. Ampicillin and carbenicillin, which are penicillins, are an exception. It is variably susceptible to tetracyclines, chloramphenicol, trimethoprim-sulfamethoxazole, and colistin.[7]