The majority of the research was conducted in Uganda at Entebbe County (1946-1960), Zika forest (1955-1965), Mpanga Forest (1958-1959) and Bwamba (1942-1948). Between 1940-1954 there was also research conducted in Kisumu, Kenya. The research papers have been constructed mostly from mosquito catch records made by Alec Haddow and other employees based at the Yellow Fever Research Institute, later renamed East African Virus Research Institute, Entebbe, Uganda. They contain vast amounts of data for each catch including its duration, the specific time when a species is caught, the total number of species caught and their classification, weather conditions, vegetation and environmental conditions. Mosquito catches were conducted from constructed platforms each identified by a number, which also represented their height in feet from the ground.
Haddow's research led to the isolation of the yellow fever virus from Aedes simpsoni and identification of the previously unknown Bunyamwera virus (see GB 248 DC 068/2/7). He pioneered the 24-hour catch method in which he was able to study the daily behaviour of mosquitos. This new method of conducting a catch was being experimented with internationally, however to date Haddow's method was the most successful at gaining results. The use of this technique lead to the first isolation of the Zika virus in a mosquito (see GB 248 DC 068/2/20). Data analysis revealed the time when virus carrying mosquitoes were more prominent in number and their preferred environmental conditions.