Dichotomous Key Gram reaction? Glucose fermentation? Morphology Acid Acid and gas Rods Cocci Plesiomonas Motile at 37C? Erysipelothrix Staphylococcus shigelloides rhusiopathiae aureus No Yes Urea hydrolyzed? Aeromonas hydrophila No Yes Indole produced? Citrate utilized? No Yes No Yes Pasteurella Pasteurella Yersinia Klebsiella haemolytica multocida enterocolitica pneumoniae Dichotomous Key