We report a case in which a strain of the U.S.A. Centers for Disease Control (CDC) dysgonic fermenter (DF) 3, together with Citrobacter freundii, was isolated from an abscess in a diabetic patient. DF 3 may be easily overlooked due to its fastidious nature, a characteristic shared with two former DF groups now placed in the genus Capnocytophaga. To our knowledge, this is the first European case report of DF 3-associated infection.