Potential Sources for a Return of Smallpox
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چکیده
The eradication of smallpox was defined by successive WHO expert groups (WHO Scientific Group on Smallpox Eradication, 1968 ; WHO Expert Committee on Smallpox Eradication, 1972) as "the elimination of clinical illness caused by variola virus". An important corollary of this definition was that it did not involve the extinction of variola virus, as some experts had urged . The procedures for the certification of smallpox eradication described in Chapter 24 were therefore designed to ensure that no human cases had occurred in the countries concerned for at least 2 years-i .e., that the human-tohuman chains of transmission of smallpox had been interrupted. Careful follow-up of CHAPTER 30
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