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A laboratory-based active surveillance program can detect cases of dengue involving all four dengue serotypes. An active surveillance program can demonstrate that dengue infections are occurring at a much higher rate than reflected by previous passive surveillance programs and this in turn demonstrates that the risk for local dengue transmission may be increasing.

Furthermore, satellite imagery analysis provides an efficient survey of large geographic regions for environmental indicators of disease risk affecting human populations and has the potential to make an effective surveillance of disease risk for vector-borne diseases practical for public health applications. The basis for the supposition that remotely sensed data will be useful for anticipating disease risk is that pathogen transmission is facilitated by arthropods, whose survival and reproduction are influenced by variations in elevation, temperature and humidity.