Fig. 2. : correlation between annual parasite index (API) and gold-mining district (GMD) production. The increased value of API is explained by tons of gold produced in a GMD (northeast Antioquia) from 2010-2013 (A: 2010; B: 2011; C: 2012; D: 2013). Populations with greater than 50 tons of gold produced had higher risk of malaria infection than those with a lower production. CI: confidence interval.