Spatial distribution of malaria incidence and per capita GDP in the Yunnan province, China, 2005–2010. (The spatial pattern of income is unevenly distributed, with average income levels significantly lower along the border and western areas. The spatial variation of malaria risk at a county level shows a disease burden that concentrates along the border area. The number in the parentheses denotes how many counties there are in each category. Kunming is the capital city of the Yunnan province and includes four main urban districts. Green pie: average annual GDP per capita, US$; Choropleth map: average annual malaria incidence, 1/10,000).