Progress against malaria has stalled. There's been an increase in the number of cases reported since 2015.
Researchers have tried unsuccessfully for decades to develop a malaria vaccine. Now a new approach, showing promise in mice, suggests it is possible to block mosquitoes from spreading the disease.
Malaria elimination in Malawi is lagging because research isn't being used properly.
Epidemiologists and public health managers are looking to complement indoor-based malaria solutions with those that focus on the outdoors. Drones are a crucial part of their armoury.
Malaria in South Africa is close to being eliminated but to complicate matters scientists have identified a second mosquito transmitting the disease.