Zviratidzo zvinowedzera nehuwandu hwehonye dziripo uye dzinogona kusanganisira kushaya mweya uye fivha pakutanga kwechirwere. Izvi zvinogona kuteverwa nezviratidzo zvekuzvimba kwemudumbu, kurwadziwa kwemudumbu, uye manyoka. Vana vanonyanya kubatwa, uye muzera iri hutachiona hunogona zvakare kukonzera kushaya huremu, kushaya chikafu, uye matambudziko ekudzidza. Kutapukirwa kunoitika nekudya chikafu kana chinwiwa chakasvibiswa nemazai eAscaris kubva kumarara. Mazai eAscaris ari mumatumbo, anochera kuburikidza nemadziro emudumbu, uye anotama kuenda kumapapu kuburikidza neropa. Ikoko vanopinda mumatumbo uye vanobatwa nehutachiona hwepasi rose.
Africa iri kumaodzanyemba kweSahara, Latin America, uye Asia