1. BACTERIAL CAUSES

2. Cocci:
1. Staph aureus
2. Streptococcus
3. Pneumococcus

4. Bacilli:
1. Neisseria
2. Corynebacterium
3. Bacillus
4. Clostridium
5. Enterobacteriacae-
Shigella,Proteus,E.coli
6. Salmonella typhi, S.paratyphi
7. Vibrio cholerae
8. Mycobacterium tuberculosis

5. MTB-acid fast

7. Others:
 Yersinia,Pasteurella, Franciella
 Treponema pallidium
 Mycoplasma
 Chlamydiae-trachoma
 Actinomycetes
 Rickettsia
 Helicobacter pylori
 Listeria-keratoconjunctivitis
 Campylobacter jejuni
 Legionella