Proteus

/Pro·te·us/ (pro´te-us) a genus of gram-negative, motile bacteria usually found in fecal and other putrefying matter,
including P. morga´nii, found in the intestines and associated with summer diarrhea of infants, and P. vulga´ris, often
found as a secondary invader in various localized suppurative pathologic processes; it is a cause of cystitis.
http://medical-dictionary.thefreedictionary.com/PROTEUS

Proteus,  can cause urinary tract infections and hospital-acquired infections.   P.mirabilis, a cause of wound and
urinary tract infections. most strains of P. mirabilis are sensitive to ampicillin and cephalosporins.  P. vulgaris is not
sensitive to these antibiotics.