PROTEUS

Proteus, like almost every other bacterium in this family, can cause urinary tract infections and hospital-acquired infections. Proteus is unique, however, because it is highly motile and does not form regular colonies. Instead, Proteus forms what are known as "swarming colonies" when plated on non-inhibitory media. The most important member of this genus is considered to be P.mirabilis, a cause of wound and urinary tract infections. Fortunately, most strains of P. mirabilis are sensitive to ampicillin and cephalosporin. Unlike its relative, P. vulgaris is not sensitive to these antibiotics. However, this organism is isolated less often in the laboratory and usually only targets immunosuppressed individuals. P. mirabilis and P. vulgaris can be differentiated by an indole test for which only P. vulgaris tests positive.

Lysine -
Hydrogen sulfide +
Motile
Urease +