The distribution of indigenous cattle sample farms (n = 209) in the 10 AEZs of Uganda. The distribution of the 209 farms/herds where 925 indigenous cattle blood samples were obtained in order to establish the overall distribution of non-clinical T. parva. Sample collection was guided by the 50 grid cells (approx. 50 x 50 Km) in which 4–6 farm households were selected. From each household farm/herd 4–5 indigenous cattle were randomly selected. The 10 agro-ecological zones (AEZs) were used to structure the indigenous cattle populations and the non-clinical T. parva infection. The sampling strategy was designed by the NextGen Project  to enable a landscape data collection.