ABSTRACT
Less sensational but potentially more devastating than these dramatic new diseases are those that are said to be “reemerging,” among them many pathogens that a triumphant twentieth-century biomedicine had declared under control.1 In some cases, such as tuberculosis, a steady decline in incidence in affluent countries has been reversed by the development of drug-resistant variants and cutbacks in public health prevention programs. In others, including the mosquito-transmitted dengue fever, a resurgence of disease has accompanied the expansion of impoverished sectors of urban centers in poor countries, with a corresponding increase in the breeding opportunities for disease vectors.
