Stenotrophomonas maltophilia

Stenotrophomonas maltophilia was originally classified as Pseudomonas. It was transferred to the genus Xanthomonas, however, and subsequently to its own genus, Stenotrophomonas, because of its pattern of biochemical reactions and its role as a human pathogen. S. maltophilia exhibits a negative indophenol oxidase reaction, and many strains require methionine for growth. A unique feature of S. maltophilia that can aid in its identification is a positive reaction on deoxyribonuclease (DNase) test agar.