<unk>  is the giant roundworm of humans, growing to a length of up to 35 cm (13.779527545 in). It is one of several species of<unk> . An<unk>  nematode of the phylum Nematoda, it is the largest and most common parasitic worm in humans. This organism is responsible for the disease<unk> sis, a type of helminthiasis and one of the group of neglected tropical diseases. An estimated one-sixth of the human population is infected by<unk>  or another roundworm.<unk> sis is prevalent worldwide, especially in tropical and subtropical countries.
Ascaris lumbricoides
Trichuris trichiura
Schistosoma mansoni
Strongyloides stercoralis
Entamoeba histolytica
Oesophagostomum
Paragonimus westermani
Cryptosporidium hominis