Cestodes (tapeworms), nematodes (roundworms), and trematodes (flukes)
1 Soil-transmitted helminth infections are caused by different species of parasitic worms. 2  They are transmitted by eggs present in human faeces, which contaminate the soil in areas where sanitation is poor. Soil-transmitted helminths are transmitted by eggs that are passed in the faeces of infected people. Adult worms live in the intestine where they produce thousands of eggs each day. Life-cycles Helminths form three main life-cycle stages: eggs, larvae and adults. Adult worms infect definitive hosts (those in which sexual development occurs) whereas larval stages may be free-living or parasitize invertebrate vectors, intermediate or paratenic hosts. Many helminths are free-living organisms in aquatic and terrestrial environments whereas others occur as parasites in most animals and some plants. Parasitic helminths are an almost universal feature of vertebrate animals; most species have worms in them somewhere. Helminth Parasites. The word ‘helminth’ is a general term meaning ‘worm’, but there are many different types of worms. Prefixes are therefore used to designate types: platy-helminths for flat-worms and nemat-helminths for round-worms. All helminths are multicellular eukaryotic invertebrates with tube-like or flattened bodies exhibiting bilateral symmetry. Many helminths are free-living organisms in aquatic and terrestrial environments whereas others occur as parasites in most animals and some plants. Parasitic helminths are an almost universal feature of vertebrate animals; most species have worms in them somewhere. Helminths are worm-like organisms living in and feeding on living hosts, receiving nourishment and protection while disrupting their hosts' nutrient absorption, causing weakness and disease. Those that live inside the digestive tract are called intestinal parasites. They can live inside humans and other animals. Helminths are a group of evolutionary unrelated organisms which share a similar form. Helminths include members of the following taxa: monogeneans, cestodes (tapeworms), nematodes (roundworms), and trematodes (flukes). The number of different helminth species is vast: it is estimated to be around one million species. Key facts. 1  Soil-transmitted helminth infections are caused by different species of parasitic worms. 2  They are transmitted by eggs present in human faeces, which contaminate the soil in areas where sanitation is poor. 3  Approximately 2 billion people are infected with soil-transmitted helminths worldwide. Soil-transmitted helminths are transmitted by eggs that are passed in the faeces of infected people. Adult worms live in the intestine where they produce thousands of eggs each day. (A parasite is a disease-causing organism that lives on or in a human or another animal and derives its nourishment from its host.) Lice are examples of parasites that live on humans; bacteria and viruses are examples of parasites that live either on humans or in humans; parasitic worms (also called helminths) live.  Home ... ... Types of disease. Roundworms in small intestine Source: The Merck Veterinary Manual. All birds are naturally subject to infection by parasitic worms, or Helminths. The majority of Helminths infect the digestive tract but some are also found in other organs, such as the brain, trachea and eye. Not all Helminth infections cause obvious clinical disease. The roundworms (or nematodes) and the flatworms (including cestodes and trematodes) are the two major classes of Helminth. ShareCompartir. Soil-transmitted helminths refer to the intestinal worms infecting humans that are transmitted through contaminated soil (helminth means parasitic worm): Ascaris lumbricoides (sometimes called just . Ascaris ), whipworm (Trichuris trichiura), and hookworm (Anclostoma duodenale and Necator americanus). Soil-transmitted helminths live in the intestine and their eggs are passed in the feces of infected persons. If an infected person defecates outside (near bushes, in a garden, or field) or if the feces of an infected person are used as fertilizer, eggs are deposited on soil.
http://www.who.int/mediacentre/factsheets/fs366/en/ http://parasite.org.au/para-site/contents/helminth-intoduction.html http://parasite.org.au/para-site/contents/helminth-intoduction.html https://en.wikipedia.org/wiki/Parasitic_worm http://www.who.int/mediacentre/factsheets/fs366/en/ http://www.medicinenet.com/script/main/art.asp?articlekey=12322 http://www.poultryhub.org/health/disease/types-of-disease/parasitic-worms-or-helminths/ http://www.cdc.gov/parasites/sth/index.html
different types of helminth worms