The discovery of malaria-causing mosquito in the Central highlands may have been a surprise to many, but not to climate change experts. Based on observed warming trends in four high-altitude sites in East Africa from late 1970s, the experts have been warning that climate change is likely to fuel the spread and severity of vector-borne diseases.
The latest Intergovernmental Panel on Climate Change (IPCCC) report notes that such trends can contribute to significant biological implications in malaria vector populations.
Although malaria cases result from a range of factors — including drug resistance, land-use change and various socio-demographic factors such as poverty — global warming is likely to increase the impact of the disease.
Unlike in malaria prone zones, people in areas considered malaria-free before have not developed immunity. The arrival of Anopheles arabiensis might therefore herald a malaria outbreak as witnessed in Rwanda.
EDIT
http://www.eastandard.net/hm_news/news.php?articleid=1143969549