Figure 4. Distribution of human population and infected and uninfected mosquitoes across the selected study areas, Gumarey and Sogan-Godud, Masalani Division of Ijara District, Kenya. A) Area homestead locations (circles) and relative area density of human population (contours, 500-m kernel density; darker color indicates higher values). B) Study trap locations (triangles) and area density of mosquitoes (contours for average mosquitoes per trap, 500-m kernel density). C) Homestead locations of mosquito pools testing positive (white circles) and negative (black circles) for Rift Valley fever virus. Relative local density of positive pools per 500 m is indicated by contours. D) Homestead locations of mosquito pools testing positive (white circles) and negative (black circles) for West Nile virus. Relative density of positive pools is indicated by contours.