The high levels of malaria in poor countries are not mainly a consequence of poverty.
Malaria is very geographically specific.
The ecological conditions that support the more efficient malaria mosquito vectors primarily determine the distribution and intensity of the disease. Intensive efforts to eliminate malaria in the most severely affected countries in the tropics have been largely ineffective. Countries that have eliminated malaria in the past half century have all been either subtropical or islands. These countries economic growth in the five years after eliminating malaria has usually been substantially higher than growth in the neighboring countries. Controlling for many other tropical diseases does not change the correlation of malaria with economic growth, and these diseases are not themselves significantly negatively correlated with economic growth.