出典:Wikipedia
出典:『Wikipedia』 (2009/12/17 06:33 UTC 版)
Geohelminths are soil-transmitted parasitic nematodes with a life cycle that involves no intermediate hosts or vectors: they infect many animals, including humans, and are spread by the faecal contamination of soil, foods and water. Most species have juvenile forms which move around the body of the host, but all species inhabit the intestine in their adult stages and release their eggs in the host's faeces. The diseases they cause can thus be local or systemic.