title: Immunization: balancing the risks.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004660:Encephalitis / Q000139:chemically induced; D004739:England; D006801:Humans; D007114:Immunization / Q000009:adverse effects*; D007223:Infant; D010567:Pertussis Vaccine / Q000009:adverse effects* / Q000592:standards / Q000627:therapeutic use; D014852:Wales; D014917:Whooping Cough / Q000453:epidemiology / Q000401:mortality
chemical_list: D010567:Pertussis Vaccine