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Eradication of smallpox was confirmed in

  • A.1980
  • B.1977
  • C.1985
  • D.1972

Answer: A

Correct answer: 1980

Two years of intensive global surveillance after the Somali case of 1977 found no further transmission, and the World Health Assembly declared smallpox eradicated in May 1980. It remains the only human disease ever eradicated. The gap between the last case and the declaration is deliberate: it is the evidence that the chain of transmission has actually been broken.

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