title: Vaccination trials in otitis media: experiences in Finland since 1977.
authors.affiliation: National Public Health Institute, Helsinki, Finland.
authors.forename: P H
authors.initials: PH
authors.lastname: Mäkelä
authors.forename: P
authors.initials: P
authors.lastname: Karma
mesh_terms: D000208:Acute Disease; D001428:Bacterial Vaccines; D002675:Child, Preschool; D002986:Clinical Trials as Topic; D005387:Finland; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D010033:Otitis Media / Q000517:prevention & control*; D013296:Streptococcus pneumoniae / Q000276:immunology; D014611:Vaccination
chemical_list: D001428:Bacterial Vaccines