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In this Issue

Prevention and Control. This issue opens with a paper that presents the interesting idea of using a computer model to estimate the impact of ultra-low volume insecticide applications on the control of epidemic dengue (see page 709). The model predicts that this approach to vector control will have little impact on disease incidence, an observation that is supported by many observations in the field. The most important aspect of this paper is the possibility that computer modeling may, in the future, help program planners avoid costly, time consuming and ineffective approaches to disease control and to select those intervention methods that would appear to have the greatest chance for success.

Epidemiology. There are seven papers in this section that deal with a widely diverse series of subjects. Starting on page 721 is a report from Peru that deals with the epidemiology of tuberculosis. Using tuberculin sensitivity testing, the authors found an overall prevalence of 34% in 368 persons examined in a Lima suburb.