Less frequently reported gram-negative fermentative rods

The clinical significance and distinguishing characteristics of less frequently reported gram-negative fermentative rods (Pasteurella, Yersinia, Vibrio, Aeromonas and Plesiomonas, Enterobacter agglomerans, and Chromobacterium) are described. Increased awareness of these organisms, a knowledge of possible sites in which they cause infection, and identification criteria which will separate them from similar bacteria will prepare the clinical microbiologist for the isolation and identification of these "unusual" organisms.