A boy with ASOM undergoing treatment with penicillin therapy for 7 days now presents with subsidence of pain and persistence of deafness, Diagnosis is:

Inadequate antibiotic treatment of acute suppurative otitis media may inactivate infection but fail to resolve it completely.Low grade infection lingers on which acts as a stimulus for the mucosa to secrete more mucus which leads to development of serous/secretory otitis media.