Proteus

Gram negative Catalase positive Oxidase negative rod Proteus mirabilus is a very common organism that crops up in infections. It is also an organism capable of swarming motility, seen completely covering up the attempted streak plate to the right. Swarming motility can be mitigated on McConkey agar

Proteus vulgaris can also cause medical problems, but is much rarer. It lacks swarming motility and colonies can be isolated.