LWW system:
Bacteria - 9 groups.
Group 1: Gram-positive cocci
Group 2: Gram-positive bacilli/rod
Group 3: Gram-negative cocci
Group 4: Gram-negative bacilli/rod
Group 5: Anaerobic organisms
Group 6: Spirochetes
Group 7: Mycoplasma
Group 8: Chylamydia
Group 9: Others