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In page Trichuriasis:

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Trichuriasis is caused by a parasitic worm also known as a helminth called Trichuris trichiura. It belongs to the genus Trichuris, formerly known as Trichocephalus, meaning hair head, which would be a more accurate name; however the generic name is now Trichuris, which means hair tail (implying that the posterior end of the worm is the attenuated section). Infections by parasitic worms are known as helminthiasis.[citation needed]