A small nematode worm that is an internal parasite of vertebrates.
- Family Oxyuridae, class Phasmida, including Enterobius vermicularis (in humans) and Oxyuris equi (in horses).
- Threadworms, or pinworms, are small intestinal worm parasites.
- You can get pinworms by unknowingly swallowing microscopic pinworm eggs.
- When I checked it out, I knew right away they were pinworms.
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