Mass vaccination programs in developing countries.
D000350:Africa, Central; D001500:BCG Vaccine / Q000266:history; D003906:Developing Countries; D004739:England; D004812:Epidemiologic Methods; D005544:Forecasting; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008457:Measles / Q000517:prevention & control; D012899:Smallpox / Q000517:prevention & control; D014611:Vaccination / Q000266:history; D014765:Viral Vaccines; D015004:Yellow Fever / Q000517:prevention & control
D001500:BCG Vaccine; D014765:Viral Vaccines