Many nematodes are microscopic. Many nematodes are parasites, and need a host to survive, and thrive. Some nematodes can be harmful to the host while others aren't at all. Nematodes will mainly compete with their host for nutrients. They can also block the lymphatic system (the system in which white blood cells are made to prevent swelling, disease, viruses etc.) which can cause swelling that is dangerous. There are four different types of parasites, human, animal, plant and insect.
References
http://classes.seattleu.edu/biology/biol235/hodin/nematodePriapulidGroup/nematodes/parasite.htm
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