The epidemiological background to vaccination programmes.
D000367:Age Factors; D006801:Humans; D007115:Immunization Schedule; D007223:Infant; D008457:Measles / Q000517:prevention & control; D008458:Measles Vaccine; D010567:Pertussis Vaccine; D012899:Smallpox / Q000453:epidemiology / Q000517:prevention & control; D006113:United Kingdom; D014612:Vaccines / Q000009:adverse effects; D014917:Whooping Cough / Q000517:prevention & control
D008458:Measles Vaccine; D010567:Pertussis Vaccine; D014612:Vaccines