Table 1. Human helminth infections of public health importance.

Helminth species	Disease or condition in humans	Estimate prevalence worldwide	Habitat of adult worm in humans
Nematodes
Ascaris lumbricoides	Ascariasis	804 million	Small intestine
Ascaris suum
Trichuris trichiura	Trichuriasis	477 million	Large intestine
Enterobius vermicularis	Enterobiasis (Oxyuriasis)	>200 million
Toxocara canis	Visceral or ocular larva migrans	Unknown	N/A
Necator americanus	Necatoriasis	472 million	Small intestine
Ancylostoma duodenale	Ancylostomiasis
Ancylostoma ceylanicum
Strongyloides stercoralis	Strongyloidiasis	30–100 million
Wuchereria bancrofti	Lymphatic filariasis	44 million	Lymphatic vessels
Brugia malayi or Brugia timori
Onchocerca volvulus	Onchocerciasis (river blindness)	17 million	Subcutaneous tissue
Trichinella spiralis	Trichinellosis	0.066 million	Small intestine
Trematodes
Schistosoma mansoni	Intestinal schistosomiasis	206 million	Mesenteric veins
Schistosoma haematobium	Urogenital schistosomiasis		Venous plexus of urinary bladder
Schistosoma japonicum	Intestinal schistosomiasis		Mesenteric veins
Fasciola hepatica	Fascioliasis	80 million	Bile ducts
Clonorchis sinensis	Clonorchiasis		Bile ducts and gall bladder
Opisthorchis spp.	Opisthorchiasis
Paragonimus spp.	Paragonimiasis		Lungs
Cestodes
Echinococcus granulosus	Hydatid disease	0.8 million	N/A
Echinococcus multilocularis	Alveolar echinococcosis	0.019 million	N/A
Cysticercus cellulosae ( Taenia solium larva)	Cysticercosis and Neurocysticercosis	1 million	N/A
Taenia solium	Intestinal taeniasis	0.38 million	Small intestine

N/A, not applicable. There is no development of adult worms in humans.