Integrated risk mapping and landscape characterisation of lymphatic filariasis and loiasis in South West Nigeria.

Nigeria has the heaviest burden of lymphatic filariasis (LF) in sub-Saharan Africa, which is caused by the parasite and transmitted by mosquitoes. LF is targeted for elimination and the national programme is scaling up mass drug administration (MDA) across the country to interrupt transmission. However, in some regions the co-endemicity of the filarial parasite (loiasis) is an impediment due to the risk of severe adverse events (SAEs) associated with the drug ivermectin.