Eradication

The dream of a world completely free of disease may seem utopian, but eradication—used in its modern sense to mean the reduction of the number of cases of a disease to zero by deliberate public health interventions—has been pursued repeatedly. Campaigns against yellow fever, malaria, and smallpox have been among the largest, most costly programs ever undertaken in international public health. But only one so far has been successful—that against smallpox. And yet in 2007 Bill and Melinda Gates su