Most common organism cultured in CSOM is
Pus culture in both aerobic and anaerobic CSOM may show multiple organisms. Common aerobic organisms are Pseudomonas aeruginosa Proteus Escherichia coli Staphylococccus aureus While anaerobes include Bacteroides fragilis Anaerobic streptococcal (Ref: Textbook of diseases of ENT, PL Dhingra, 7th edition, pg no. 76)
Staphylococcus aureus
Staphylococcus epidermidis
Staphylococcus pneumonia
Pseudomonas aeruginosa
Ear