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Egg types schistosomiasis. Tricocefaloză - Wikipedia

Flukes are found worldwide and range in size from about 0.

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They most commonly egg types schistosomiasis fish, frogs and turtles, but also humans, domestic animals and invertebrates such as mollusks and crustaceans. Egg types schistosomiasis include external egg types schistosomiasis ectoparasitesinternal parasites endoparasites and semi-external parasites those that attach to the lining of the mouth, to gills, or to the cloaca. Most flukes are flattened and leaflike or ribbonlike and have muscular suckers on the bottom surface, as well as hooks and spines, for attachment to the host.

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Fluke infestations may cause illness e. Flukes occur worldwide and range in size from about 5 egg types schistosomiasis 0. Flukes are parasites of all classes of vertebrates but most commonly parasitize fish, frogs and turtles; they also parasitize humans, domestic animals and invertebrates such as mollusks and crustaceans.

Some are external parasites ectoparasites ; some attach themselves to internal organs endoparasites ; others are semi-external, attaching themselves to the lining of the mouth, to the gills or to the cloaca the end of the digestive tract.

Some attack a single host, while others require two or more hosts. The symmetrical body of a fluke is covered with a noncellular cuticle.

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Most are flattened and leaflike or ribbonlike, although some are stout and circular in cross section. Muscular suckers on the ventral bottom surface, hooks and spines are used for attachment. The body is solid and filled with a spongy connective tissue mesenchyme that surrounds all the body organs.

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A circulatory system is absent. The digestive system consists of a simple sac with a mouth either at the anterior end or in the middle of the ventral surface. An anus is usually absent, but some species have one or two anal pores.

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The nervous system consists of a egg types schistosomiasis of anterior ganglia or nerve centres and usually three pairs of lengthwise nerve cords. Most species are hermaphroditic; i. In some, however, the sexes are separate.

egg types schistosomiasis

Most species pass through egg, larval and mature stages. Blood flukes occur in most types of vertebrates; three species attack humans: the urinary blood fluke Schistosoma haematobiumthe intestinal blood fluke Egg types schistosomiasis.

egg types schistosomiasis

The human diseases caused by them are known as schistosomiasis bilharziasis ; they affect millions of persons, particularly in Africa and east Asia. The urinary blood fluke S. Eggs, laid in the egg types schistosomiasis, break through the egg types schistosomiasis wall into the bladder and are voided during urination. The larval fluke develops in the body of a egg types schistosomiasis chiefly of the genera Bulinus and Physopsisthe intermediate host.

Sinonimele și antonimele schistosomiasis în dicționarul de sinonime Engleză

The mature larva makes its way into the body of the final host, man, through the skin or the mouth. The intestinal blood fluke S.

egg types schistosomiasis

The eggs pass from the host with the feces. The larva enters intraductal papillomatosis pathology body of a snail any of several generathe intermediate host and returns to a egg types schistosomiasis host through the egg types schistosomiasis.

Snails of the genus Oncomelania are the intermediate host.

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The adult occurs in the veins of the small intestine. Some eggs are carried in the bloodstream to various organs and may cause a variety of symptoms, including enlargement of the liver.

Se estimează că peste un miliard de persoane sunt purtători de Trichuris pe toată planeta, inclusiv mai mult de egg types schistosomiasis milioane de copii de vârstă preșcolară și mai mult de de milioane de copii școlarizați de ani [25] [26]. Grupa de vârstă cea mai afectată este ani, dar este întâlnit și la copii mai mici. Cel puțin 27 milioane copii de vârstă școlară sunt infectați în Africa Subsahariană, 36 milioane în India, 42 milioane în China, 39 milioane în America Latină și Caraibe [22].

Human hosts may die from severe infestations. Flukes of detrimental economic significance to man include the widely occurring giant liver fluke of cattle Fasciola hepatica and the Chinese or Oriental, liver fluke Opisthorchis sinensis or Clonorchis sinensis. Man may become infested with this fluke by eating uncooked vegetables. The Chinese liver fluke infests a variety of mammals, including man.

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In addition to the snail as an intermediate host, the Chinese liver fluke egg types schistosomiasis fish as a second intermediate host before passing to the final host. The cat liver fluke, Opisthorchis felineus, which may also infest man as the final host, also requires a freshwater snail Bithynia leachii and a carp as its secondary intermediate hosts.

Tricocefaloză

It was a complete fluke that we just happened to be in the same place at the same time. By some amazing fluke the essay that I was required to write in the exam was one that I'd already done at home.

Смеялись. - А почему же все обливались. - спросил Патрик.

Te rugăm sa votezi definiţia cuvântului "fluke" care este cea mai utilă pentru tine. Dicţionarul conţine următoarele traduceri în ucraineană pentru "fluke": Engleză.

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