Malaria In Nepal

One teacher of mine often gives an "Intro to Nepal" talk that includes statements about pre-WWII malaria barrier that prevented the British from crossing the jungly Terai belt of southern Nepal and conquering the Rana regime in control of the Kathmandu Valley for the last 300 years. 

It is common knowledge that one of the first USAID projects in Nepal was the planned eradication of malaria in 1951.  The intended aim of which was to reduce mortality rates in this southernmost region.  Opportunity for hill tribes to move south to more arable, malaria-free land was an unforeseen consequence which leaves more than imprints of hostility on the Madeshi (native peoples) of this Terai area, complicating the constitution-writing process in various ways.

However, it seems that USAID was not successful - while malaria is not considered a risk in the higher-altitude areas of Nepal, including the Kathmandu Valley, there still remains risk in the terai belt.