Some parasitic worms, including leeches and monogeneans, are ectoparasites – thus, they are not classified as helminths, which are endoparasites. Parasitic worms live in and feed in living hosts. …

Intestinal parasites include worms and one-celled organisms that rely on human hosts (their guts in particular) to hatch, grow and thrive. They spread when an unsuspecting host unknowingly ingests …

May 4, 2023 · Parasitic worms live in and feed off living hosts. Learn about parasitic worms in humans, transmission, treatment, how to avoid being a host, and more.

Jul 20, 2025 · Parasitic worms, or helminths, are multicellular organisms that live within and derive nourishment from a host. These organisms represent a global health concern, impacting humans …

Oct 10, 2022 · Learn about the most common parasitic infections in humans. We explain their symptoms, how they are transmitted, and available treatments.

Nov 14, 2024 · A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: …

Aug 18, 2025 · We asked experts how parasites are transmitted, what it feels like to be infected, and what you can do to protect yourself.

Sep 11, 2025 · While intestinal worms live in the gut and cause symptoms, there also are common non-GI signs and symptoms of intestinal worms. A rash is often the first sign of infection with parasitic …

Helminth is a general term for parasitic worms. Scientists further classify them as flukes (trematodes), tapeworms (cestodes), roundworms (nematodes) and thorny-headed worms (acanthocephalans). …

Nov 17, 2025 · Parasites infect humans through food, water, and insect bites and cause symptoms like diarrhea, nausea, and fever. Early treatment prevents complications.