LoiasisOnchocerciasisLoaOnchocerciasis, OcularOnchocercaIvermectinOnchocerca volvulusFilaricidesMicrofilariaSimuliidaeEye Infections, ParasiticAntiparasitic AgentsDiethylcarbamazineCameroonAnthelminticsSkin Diseases, ParasiticGabonAntibodies, HelminthMansonelliasisAntinematodal AgentsEndemic DiseasesAfrica, WesternAntigens, HelminthLiberiaDemocratic Republic of the CongoGuineaChorioretinitisEye DiseasesAfricaInsect ControlTogoNeglected DiseasesEcuadorSierra LeoneOptic AtrophyEyeCentral African RepublicBlindnessNigeria