otitis media(2) IgG(1) voice(1) serum testing(1) PCV(1) Streptococcus pneumoniae(1) Chronic cough(1) Whooping cough(1) acute otitis media(1) children(1) Diagnosis(1) Laryngitis(1) subacute cough(1) complications of otitis media(1) Moraxella catarrhalis(1) Larynx(1) Bordatella pertussis(1) pneumococcal vaccination(1) Haemophilus influenzae(1) Immunoglobulin G(1) laryngeal(1) Vaccines(1)