title: Trends in immunization.
mesh_terms: D001428:Bacterial Vaccines; D002648:Child; D002675:Child, Preschool; D003140:Communicable Disease Control; D006801:Humans; D007114:Immunization; D007223:Infant; D014765:Viral Vaccines
chemical_list: D001428:Bacterial Vaccines; D014765:Viral Vaccines