Most common organism causing both ASOM + CSOM includes
(A) Streptococcus pneumoniae # ASOM: Most common organisms in infants and young children are Streptococcus pneumonia (30%), Haemophilus influenzae (20%) and Morexella catarrhalis (12%). Other organisms include streptococcus pyogenes, staphylococcus aureus and sometimes pseudomas aeroginosa. In about 18-20%, no growth is seen. Many of the strains of H. influenzae and Morexella catarrhalis are /3-lactamase producing.> CSOM: Pus culture in both types of aerobic and anaerobic CSOM may show multiple organisms. Common aerobic organisms are PS aeruginosa, Proteus, Esch. coli & Staph, aureus, while anaerobes include Bacteroides fragilis and anaerobic streptococci.
Streptococcus pneumoniae
Staphylococcus
H. influenza
Moraxella
Miscellaneous (E.N.T.)