Gram Negative

Bacterial Morphology	Probable Organisms
Bacilli	Enterobacterales P. aeruginosa Stenotrophomonas maltophilia Other nonfermentative bacilli
Coccobacilli/ pleomorphic bacilli	Aggregatibacter spp Bacteroides spp and related species Brucella spp Cardiobacterium hominis Eikenella corrodens Francisella spp Haemophilus influenzae/ parainfluenzae Kingella spp Pasteurella spp Other anaerobic bacilli
Fusiform bacilli	Capnocytophaga spp Fusobacterium spp
Curved bacilli	Campylobacter spp Helicobacter spp Vibrio spp
Diplococci	Acinetobacter spp Moraxella catarrhalis Neisseria spp