Smallpox in Sierra Leone. II. The 1968-69 eradication program.
D004197:Disease Reservoirs; D005500:Follow-Up Studies; D005843:Geography; D006801:Humans; D007391:International Cooperation; D008457:Measles / Q000517:prevention & control; D012494:Sampling Studies; D012807:Sierra Leone; D012899:Smallpox / Q000453:epidemiology / Q000517:prevention & control*; D014481:United States; D014611:Vaccination