A very slender parasitic nematode worm, especially a pinworm.
- One of their main parasites is a gut nematode, the caecal threadworm T. tenuis, which has a direct lifestyle with no alternative hosts within the same habitat.
- Rectally administered tobacco infusions - whether employed against pinworms, roundworms, tapeworms, or threadworms - proved an effective vermifuge in sixteenth-century Europe.
- Little threadworms and hookworms are about one centimetre long, while roundworms are about 20 cm long and our friend the tapeworm can reach up to 10 metres in length.
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