Most common organism causing both ASOM + CSOM includes: (A) Streptococcus pneumoniae, (B) Staphylococcus, (C) H. influenza, (D) Moraxella
Answer is A. (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.