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Encyclopedic overview
Eggs of different species of parasitic worm
Parasitic worms, also known as helminths, are a polyphyletic group of large macroparasites; adults can generally be seen with the naked eye. Many are intestinal worms that are soil-transmitted and infect the gastrointestinal tract. Other parasitic worms such as schistosomes reside in blood vessels.
Excerpted from Wikipedia’s “helminth” article, available under the CC BY-SA 4.0 licence.