This project will tackle an important implementation research problem. We will evaluate a new approach to improve access to diagnosis for malaria amongst those patients who seek malaria treatment in the informal health sector. This will lead to improved targeting of subsidized antimalarials to those patients who need them and reduce overuse and over-treatment. The approach uses an innovative public-private partnership between community health workers and retail medicine shops. The project will be conducted in collaboration with Kenya's Division of Malaria Control and avenues to roll-out the intervention, if successful, will be actively explored.