Climate change is redrawing the map of malaria risk across Africa, with cases expected to rise in East Africa and the continent's southern regions while the threat may ease in West and Central Africa, according to an analysis of historic data and future predictions.
The findings suggest that malaria hot spots — areas where transmission is most intense and cases are most concentrated — are not fixed. As temperatures and rainfall patterns shift, the environmental conditions that allow malaria-carrying mosquitoes to thrive are moving, potentially exposing new populations and reducing risk in others.
Malaria remains one of the most significant public health threats in Africa, particularly among children under five. The disease is transmitted by Anopheles mosquitoes, whose life cycle and geographic range are highly sensitive to temperature and water availability. Warmer conditions can accelerate mosquito development and parasite replication, while changes in rainfall can create or eliminate the standing water where mosquitoes breed.
The analysis draws on historical malaria data alongside climate projections to identify where transmission is likely to intensify or decline. East Africa and southern Africa emerge as regions where cases could increase, while West and Central Africa may see a reduction in malaria burden. The shift has implications for public health planning, as countries that have historically invested less in malaria control may find themselves facing growing caseloads.
Health systems across the continent already struggle with limited resources, and a changing disease map could strain them further. Areas newly at risk may lack the infrastructure, diagnostic capacity, and vector-control programs that have been built up in traditional malaria zones over decades. Conversely, regions where risk declines could redirect resources, though experts caution that gains may not be permanent if climate conditions continue to evolve.
The findings add to a growing body of research on how climate change affects infectious diseases. Malaria is not the only illness influenced by environmental shifts, but its close relationship with temperature and rainfall makes it a particularly clear indicator of how climate change can alter public health outcomes.
For policymakers, the study underscores the need for adaptive strategies. Malaria control efforts — including insecticide-treated bed nets, indoor spraying, and preventive treatment — have reduced cases dramatically in many parts of Africa. But if transmission zones move, those gains could be unevenly distributed unless surveillance and response systems keep pace.
Researchers emphasize that the relationship between climate and malaria is complex. Local factors such as land use, urbanization, water management, and the effectiveness of health interventions also play major roles. Climate projections provide a broad picture, but the actual burden will depend on how societies prepare and respond.
The study's authors suggest that understanding these shifts can help governments and international organizations target resources more effectively. Rather than assuming malaria risk is static, they argue, public health planning should account for a changing climate and the possibility that the disease will appear in places where it was once rare — or fade where it has long been endemic.
As global temperatures continue to rise, the geography of malaria in Africa is likely to keep changing. The challenge for the continent will be to anticipate those changes and protect the populations most vulnerable to a disease that remains a leading cause of illness and death.
