title: Trial of an oral antigen in upper respiratory tract infections in two Bristol schools.
mesh_terms: D000284:Administration, Oral; D000293:Adolescent; D000942:Antigens, Bacterial / Q000008:administration & dosage*; D002648:Child; D002986:Clinical Trials as Topic; D005260:Female; D006193:Haemophilus influenzae / Q000276:immunology; D006801:Humans; D007114:Immunization; D007711:Klebsiella pneumoniae / Q000276:immunology; D008297:Male; D009343:Neisseria / Q000276:immunology; D010919:Placebos; D012141:Respiratory Tract Infections / Q000453:epidemiology / Q000517:prevention & control*; D013210:Staphylococcus / Q000276:immunology; D013291:Streptococcus / Q000276:immunology; D013297:Streptococcus pyogenes / Q000276:immunology
chemical_list: D000942:Antigens, Bacterial; D010919:Placebos