Soil transmitted helminths (STH) is intestinal nematode which need soil as the media for the development of infective form. The main species that infect humans are the Ascaris lumbricoides, Trichuris trichuira, and hookworms (Ancylostoma duodenale and Necator americanus). Survey by Riau Provincial Health Office at 30 primary schools at Kampar regency in 2014 found that prevalence of worm i…