<prompt> Most common cause of acute otitis media -H. influenzaStrepto-pneumoniaeStaph aureusPseudomonas  <response>: Ans. is b i.e., Strepto-pneumoniae o The most common causative organism is streptococcus pneumoniae. Other common organisms are H. influenzae and Moraxella catarrhalis. Less common causative organisms are streptococcus pyogenes, staphylococcus aureus and E.coli. 