District Mapping Onchocerciasis, Lymphatic Filariasis, and Loiasis in Gabon

Research question

To define a cost-effective strategy to map Ivermectin-naïve districts for Onchocerciasis, Lymphatic Filariasis, and Loiasis in the context of elimination of these NTDs


The purpose of the study was to define a cost-effective and accurate method to map ivermectin-naïve districts for Onchocerciasis, Lymphatic Filariasis and Loiasis and identify districts eligible for safe treatment with ivermectin MDA. The study aimed primarily to validate a statistical model calibrated to determine whether community-level prevalence of Loa infection of >20,000 mf/mL is less than 1% in a community by comparing results of the model to results of a community-level random sample prevalence assessment. (2019-11-10)

Study sites


Notes on sample size: for the 3 districts, there will be 9,000 individuals for implementation/investigation phase and 25,000 for the validation phase.