Abstract. Helminths (parasitic worms) that cause helminthiasis are one of the most ancient and numerous forms of life on our planet. In humans, over 350 species of helminths have been registered as parasitism, which belong mainly to two types of worms; roundworms (class Nematoda) and flatworms (class tapeworms Cestoidea and flukes Trematoda). Helminthiases are helminthic diseases caused by helminths (lower worms). Helminthiasis is characterized by a long course of painful conditions and a variety of symptoms. Helminthiasis in children is a pathological condition that develops as a result of infection of the child’s body with parasitic worms.