Trial of an oral bacterial antigen against common colds.
D000284:Administration, Oral; D000293:Adolescent; D000328:Adult; D000368:Aged; D000941:Antigens / Q000008:administration & dosage*; D000942:Antigens, Bacterial / Q000008:administration & dosage; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000517:prevention & control*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010919:Placebos; D013997:Time Factors; D014611:Vaccination
D000941:Antigens; D000942:Antigens, Bacterial; D010919:Placebos