Stomach VolvulusOnchocerca volvulusIntestinal VolvulusGastrointestinal TractStomachOnchocerciasisDigestive SystemOnchocercaSimuliidaeDigestive System Physiological PhenomenaDigestive System NeoplasmsIvermectinIntestinal ObstructionCecal DiseasesDigestive System DiseasesStomach NeoplasmsOnchocerciasis, OcularGastrointestinal NeoplasmsUpper Gastrointestinal TractMicrofilariaStomach DiseasesGastrointestinal DiseasesColon, SigmoidGastric MucosaAntigens, HelminthIntestine, SmallIntestinesDigestive System AbnormalitiesLower Gastrointestinal TractColonic DiseasesIntestinal MucosaCecumFilaricidesDuodenumColonIntestine, LargeDigestionDigestive System Surgical ProceduresGastrointestinal MotilityStomach UlcerMansonelliasisDNA, HelminthAntibodies, HelminthGastrointestinal ContentsIleumUrinary Tract InfectionsFecesTorsion AbnormalityEndoscopy, GastrointestinalGerm-Free Life