Stomach VolvulusOnchocerca volvulusIntestinal VolvulusStomachGastrointestinal TractOnchocerciasisOnchocercaDigestive SystemSimuliidaeIvermectinIntestinal ObstructionCecal DiseasesOnchocerciasis, OcularStomach NeoplasmsDigestive System Physiological PhenomenaUpper Gastrointestinal TractGastrointestinal NeoplasmsMicrofilariaStomach DiseasesColon, SigmoidGastrointestinal DiseasesAntigens, HelminthGastric MucosaLower Gastrointestinal TractIntestine, SmallColonic DiseasesFilaricidesDigestive System AbnormalitiesIntestinesIntestinal MucosaCecumStomach UlcerMansonelliasisColonDNA, HelminthAntibodies, HelminthIntestine, LargeDuodenumUrinary Tract InfectionsTorsion AbnormalityGastrointestinal Motility