Smallpox eradication in the Americas.
D001118:Argentina; D001938:Brazil; D002677:Chile; D003365:Costs and Cost Analysis; D005069:Evaluation Studies as Topic; D005612:Freeze Drying; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D009656:North America; D010175:Pan American Health Organization; D010239:Paraguay; D011159:Population Surveillance; D012899:Smallpox / Q000266:history / Q000517:prevention & control*; D012900:Smallpox Vaccine; D013020:South America; D014481:United States; D014583:Uruguay; D012901:Variola virus / Q000302:isolation & purification; D014944:World Health Organization
D012900:Smallpox Vaccine