trichina

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trichina

(trĭkī`nə), common name for species of roundworm of the phylum NematodaNematoda
, phylum consisting of about 12,000 known species, and many more predicted species, of worms (commonly known as roundworms or threadworms). Nematodes live in the soil and other terrestrial habitats as well as in freshwater and marine environments; some live on the deep
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. The species Trichinella spiralis is an important parasite, occurring in rats, pigs, and man, and is responsible for the disease trichinosistrichinosis
or trichiniasis
, parasitic disease caused by the roundworm Trichinella spiralis. It follows the eating of raw or inadequately cooked meat, especially pork.
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. The small adult worms mature in the intestine of an intermediate host such as a pig. Each adult female produces batches of up to 1,500 live larvae, which bore through the intestinal wall, enter the blood and lymphatic system, and are carried to striated muscle tissue. Once in the muscle, they encyst, or become enclosed in a capsule. Larvae encysted in the muscles remain viable for some time. When the muscle tissue is eaten by a human, the cysts are digested in the stomach; the released larvae migrate to the intestine to begin a new life cycle. Female trichina worms live about six weeks and in that time may release 15,000 larvae. The migration and encystment of larvae can cause fever, pain, and even death. Encysted larvae in pork are destroyed by thorough cooking or long periods of low-temperature storage. Trichina are classified in the phylum NematodaNematoda
, phylum consisting of about 12,000 known species, and many more predicted species, of worms (commonly known as roundworms or threadworms). Nematodes live in the soil and other terrestrial habitats as well as in freshwater and marine environments; some live on the deep
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.

Trichina

 

(Trichinella spiralis), a parasitic roundworm of the family Trichinellidae. Adult males measure 1.2–1.6 mm in length, and females measure as much as 4.5 mm. The worms usually live in the intestines of predatory or omnivorous mammals and human beings; they cause trichinosis. Fertilized females penetrate the intestinal wall of the host and hatch tiny viable larvae measuring 0.09–0.1 mm in length and 0.006 mm in width. The larvae are carried by lymph and blood through the host’s body and migrate from the capillaries to striated muscles. There they grow and after two or three weeks become encysted as a result of the protective reaction of the host, remaining viable for a year or more. To continue their development, trichinae must reach the intestine of another mammal.This happens when the flesh of an infested animal is consumed. A human being may become infected by eating pork or the insufficiently roasted or boiled meat of other animals. Encysted larvae develop into adult worms in the intestine.

References in periodicals archive ?
Trichinella and HEV were identified as key human disease concerns in both provinces, with prevalence of 58.
La microbiota parece jugar un papel fundamental en el establecimiento de Trichinella spiralis en su nicho intestinal.
ELISA testing identified IgG antibodies to Trichinella in patient D.
2000) Delayed expulsion of the nematode Trichinella spiralis in mice lacking the mucosal mast cell-specific granule chymase, mouse mast cell protease-1.
I began my professional career as a laboratory scientist in the field of medical parasitology, investigating the molecular biology of an infectious foodborne nematode, Trichinella spiralis.
Behavioural changes in breeding American Kestrels infected with Trichinella pseudospiralis.
Methimazole- mediated enhancement of albendazole oral bioavailability and anthelmintic effects against parenteral stages of Trichinella spiralis in mice: the influence of the dose-regime.
En el reporte del ano 2006 en Argentina se evidencio alto numero de casos producidos por Norvovirus, Shigella y Trichinella.
Outros patogenos levantados com menor frequencia foram: Streptococcus (7,4%), Campylobacter (5,6%), Virus da hepatite E (5,6%), Salmonella (3,7%), Taenia solium (3,7%) e Virus hepatitis B, Trichophyton verrucosum, Trichinella, Cryptosporidium Babesia e Toxocara com 01 artigo (1,9%) cada.
Toxoplasma gondii, mycobacteria, Trichinella, and prion-based diseases.
Pero, incluso, si Mozart comio carne de cerdo es improbable que estuviera infectada, por la larva de Trichinella spiralis, porque la alimentacion de los porcinos en ese tiempo se basaba en granos y no en residuos carnicos.
La triquinelosis es una zoonosis parasitaria transmitida por alimentos, causada por nematodos intestinales del genero Trichinella.