Letter: Oral bacterial vaccine and colds.
D000293:Adolescent; D001428:Bacterial Vaccines / Q000627:therapeutic use*; D001991:Bronchitis / Q000628:therapy; D002648:Child; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000628:therapy*; D006801:Humans; D012572:School Health Services
D001428:Bacterial Vaccines