title: Letter: Oral bacterial vaccine and colds.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D001428:Bacterial Vaccines / Q000008:administration & dosage*; D002648:Child; D002986:Clinical Trials as Topic; D003139:Common Cold / Q000517:prevention & control*; D006801:Humans
chemical_list: D001428:Bacterial Vaccines