Over 870 million children are at risk of parasitic worm infection. Birds are the definitive hosts for this parasitic worm. Mebendazole (MBZ) is a medication used to treat a number of parasitic worm infestations. Freshwater fish are a second intermediate host for the parasitic worm. A hookworm is a type of parasitic worm (helminth). Australamphilina elongata is a species of parasitic worm in the order Amphilinidea. Taken orally, the drug paralyses and sterilises the parasitic worm that causes the illness. "Meconema thalassinum" is a host for the parasitic worm "Spinochordodes tellinii". Supposing it to be a parasitic worm, in 1829 Cuvier gave it a generic name. Dicyema shimantoense is a parasitic worm of the Phylum Dicyemida. A similar parasitic worm is "Paragordius tricuspidatus". "T. exiguus" is a widespread intestinal parasitic worm. The hectocotylus when found in females was originally described as a parasitic worm. Another is Trematoda a parasitic worm commonly referred to as a fluke. Ringworm (dermatophytosis) is actually caused by various fungi and not by a parasitic worm.