Alcaligenes xylosoxidans subspecies xylosoxidans (Achromobacter xylosoxidans)
An aerobic, oxidase-positive, gram-negative bacillus that is widely distributed in the environment. It is part of the normal bacterial flora of the intestinal tract of vertebrates. It can be isolated from soil, fresh water, salt water, and dairy products. It can be an human opportunistic pathogen.