HelminthiasisHelminthiasis, AnimalHelminthsNeglected DiseasesAscaris lumbricoidesAnthelminticsTrichurisAscariasisAncylostomatoideaTrichuriasisMagicSierra LeoneSoilIntestinal Diseases, ParasiticToilet FacilitiesHookworm InfectionsStrongyloides stercoralisDuddingtoniaNecator americanusSchistosomiasisCentral Nervous System HelminthiasisAncylostomaAlbendazolePraziquantelFecesParasite Egg CountHygienePrevalenceNigeriaCross-Sectional Studies