Study sites. Entomological, epidemiological and climatic data sets are being gathered for both the Nuqui and El Bagre regions (see figure A). The first study site is located on the Colombian Pacific coast (B); the El Bagre prone-region is located along the floodplains of the Cauca and Nechi Rivers, in north-western Colombia (C). The topography is represented using Digital Elevation Models for a 30"-arc spatial resolution. The circles represent the location of principal towns. The triangles represent the location of nearby weather stations (ordinary weather stations CO and principal weather stations CP).