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About 90% of nematodes reside in the top 15 cm (6") of soil. Nematodes do not decompose organic matter, but, instead, are parasitic and free-living organisms that feed on living material. Nematodes can effectively regulate bacterial population and community composition—they may eat up to 5,000 bacteria per minute.
There may be as many as 300,000 species of parasites affecting vertebrates, [9] and as many as 300 affecting humans alone. [10] Helminths of importance in the sanitation field are the human parasites, and are classified as Nemathelminthes (nematodes) and Platyhelminthes, depending on whether they possess a round or flattened body, respectively. [8]
The adult C. elegans hermaphrodite has 959 somatic cells and the male has 1033 cells, [56] [57] [58] although it has been suggested that the number of their intestinal cells can increase by one to three in response to gut microbes experienced by mothers. [59]
Gongylonema pulchrum is the only parasite of the genus Gongylonema capable of infecting humans. Gongylonema pulchrum infections are due to humans acting as accidental hosts for the parasite. There are seven genera of spirudia nematodes that infect human hosts accidentally: Gnathostoma, Thelazia, Gongylonema, Physaloptera, Spirocerca, Rictularia.
Eutely has been confirmed to certain degrees in various forms of diversity and sections of the tree of life.Examples include rotifers, many species of nematodes (including ascaris and the organism Caenorhabditis elegans whose male individuals have 1,033 cells [3] [4]), tardigrades, larvaceans and dicyemida.
Ascaris lumbricoides is a large parasitic roundworm of the genus Ascaris. It is the most common parasitic worm in humans. [1] An estimated 807 million–1.2 billion people are infected with Ascariasis. lumbricoides worldwide. [2] People living in tropical and subtropical countries are at greater risk of infection.
The microscopic nematode Caenorhabditis elegans, for example, is composed of only a thousand cells but has about the same number of genes as a human. [ 1 ] [ 2 ] Researchers suggest resolution of the paradox may lie in mechanisms such as alternative splicing and complex gene regulation that make the genes of humans and other complex eukaryotes ...
According to Kamal, the human immune system needs Th1 cells to effectively fight TB. [24] Since the immune system often responds to parasitic worms by inhibiting Th1 cells, parasitic worms generally worsen tuberculosis. [24] In fact, Tuberculosis patients who receive successful parasitic therapy experience major improvement. [24]