A nematode worm, especially a parasitic one found in the intestines of mammals.
- Many species in the class Phasmida, including the large Ascaris lumbricoides in humans.
- Before the Ontario Ministry of Health decided that raw fish must be frozen before it can be served, no one was worried about parasitic roundworms.
- Transmission of roundworm, whipworm and hookworm requires a warm wet environment to ensure survival of eggs or larvae in soil that is contaminated with human faeces.
- Canine heartworm is a serious and potentially fatal parasitic condition, transmitted by mosquitoes, in which roundworms develop in the heart and major blood vessels of dogs.
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