A life-threatening disease caused by parasites that are transmitted to humans through bites of infected mosquitoes. Most Malaria deaths occur in Africa, particularly among young children. Transmission depends on climatic conditions that may affect the abundance and survival of mosquitoes, such as rainfall patterns, temperature and humidity. In many places, transmission is seasonal, with the peak during and just after the rainy season. Mosquito-control through sprays and insecticides is used in malaria-vulnerable areas. A problem, however, is the development of mosquito-resistance to these insecticides.