<prompt> Most common organism cultured in CSOM isStaphylococcus aureusStaphylococcus epidermidisStaphylococcus pneumoniaPseudomonas aeruginosa  <response>: 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 