Bacteria

Gram Positive

Cocci

• Staphylococcus – forms clusters, facultative anaerobe
• Streptococcus – forms pairs & chains, facultative anaerobe
• Enterococcus - forms pairs & chains, facultative anaerobe

Bacilli

• Bacillus – sporing, aerobic
• Clostridium – sporing, anaerobic

• Corynebacterium – non-sporing, facultative anaerobe
• Listeria – non-sporing, aerobic (or microaerophilic)
• Lactobacillus – non-sporing, anaerobic (or microaerophilic)
• Propionibacterium – non-sporing, anaerobic

• Nocardia – branching, aerobic
• Actinomyces – branching, anaerobic

Gram Negative

Cocci

• Neisseria - aerobic
• Moraxella – aerobic

Bacilli

• Enterobacteriaceae – aerobic (enterobacter, escherichia, salmonella, etc)
• Parvobacteria – varies (Brucella microaerophilic, Haemophilus facultative anaerobe, Bordetella obligate aerobes, Legionella aerobic)
• Pseudomonas - aerobic
• Bacteriodes - anaerobic
• Fusobacterium – anaerobic

Comma-shaped

• Vibrios – facultative anaerobes (vibrio, campylobacter, helicobacter)

Spiral bacteria

• Borrelia
• Treponema
• Leptospira

Acid-fast bacilli

• Mycobacterium

Cell-wall deficient bacteria

• L-forms
• Protoplasts