SBM 2044 Medical Microbiology Bacteria International Islamic University of Malaysia Table of Gram reaction of Medically Important Bacteria Bacteria are designated at Genus level Gram positive Gram negative Aerobic Facultative Microaeroph ilic Anaerobic Aerobic Facultative Microaeroph ilic Anaerobic C O C C I Staphylococcus Streptococcus Enterococcus Peptococcus Neisseria F Moraxella F Veillonella F B A C I L L I Bacillus Listeria Corynebacterium Actinomyces israelii Clostridium F Pseudomonas Escherichia Salmonella Shigella Klebsiella Proteus Yersinia Vibrio Haemophilus F Brucella F Bordetella F Legionella F Campylobacter F Helicobacter F Bacteriodes F Prevotella F Fusobacteria F