An aerobic, oxidase-positive, gram-negative bacillus that produces a reddish-tan or pink pigmented colony. It produces abundant hydrogen sulfide. This isolate of Shewanella putrefaciens has been identified as belonging to Group A using the Biolog classification system. It has been isolated environmentally from dairy products, foodstuffs, petroleum, soil, and water. It has been isolated from the respiratory tract, wounds, urogenital tract, and feces of humans but rarely had any clinical significance.