Roundworms. Nematodes (roundworms) are found just about everywhere in the world. Many are free-living in the soil. Many others are parasites of plants and animals. Among the examples shown here are whipworms, heartworms, guinea worms (Dracunculus), eye worms (Loa loa), trichinosis, river blindness, and filarial elephantiasis.In several cases we get these from insect vectors, mainly mosquitoes; others like trichinosis, from undercooked meat (pork). Most people find roundworms among the most dis9444
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