1. Cocci (spherical)

- Streptococcus

- Staphylococcus

- Neisseria

2. Bacilli (rod-shaped)

- Escherichia coli

- Pseudomonas aeruginosa

- Bacillus subtilis

3. Spirilla (spiral-shaped)

- Treponema pallidum

- Vibrio cholerae

- Leptospira interrogans