In recent decades, however, scientists have noted an increase in epidemics in the region, as well as in sporadic cases like Njoki's.
Many medical and environmental experts attribute the spike in malaria to climate change, in the form of warmer temperatures and variations in rainfall patterns. (See a .)
"We are now finding malaria in places that we did not expect to find it, particularly the highland regions that used to be too cool for malaria," said Dorothy Memusi, deputy director of the Malaria Division in Kenya's Ministry of Health.
Changes in temperature can affect the development and survival of malaria parasites and the mosquitoes that carry them, according to a joint 2004 study by the State University of New York, Buffalo, and the Kenya Medical Research Institute.
Rainfall also influences the availability of mosquito habitats and the size of mosquito populations, the research found.
