LIFE CYCLE OF TAENIA SAGINATA PDF

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Taenia saginata. Beef Tapeworm. History of Discovery return to top. Tapeworm infections have been recorded in history from B. Taenia saginata was differentiated from Taenia solium infection by the late s. However, the exact life cycle of T. Morphology return to top. It is about 6 to 7 milimeters in width. The adult T. Unlike the T. Picture of a T. Identical to the T. Incubation Period return to top. It takes about 5 to 12 weeks for the worm to mature into adulthood in the human intestine.

Usually only a single worm is present at at time. However, multiple worms have been known to inhabit the human body. Click on the picture above to see labels of Proglottid segments. Humans are the only known definative hosts for T. The life cycle begins with the ingestion of raw or undercooked beef containing T. The larvae gets digested out of the beef in the human intestinal system. The worm then attaches on the intestinal mucosa of the upper small intestine. The tapeworm will digest food and grow longer.

Mature tapeworms will release 10 single gravid proglottids daily via the feces or will spontaneous be released from the anus. Proglottids are motile and will shed eggs as it moves. These eggs containing the oncosphere can remain viable for several days to weeks in sewage, rivers, and pastures. Cattles are the only intermediate host of the T. Cattle will eat the eggs and the oncospheres will hatch in the duodenum under the influence of gastric juices. It will envaginate into the intestinal walls and travel via the general circulatory system.

The embryos will disseminate all over the body and develop cysticercus in striated muscles of the cow within 70 days. Human beings will be infected if they eat the cow meat at this time. Cysticercus begins to degenerate in 4 to 6 months. By the 9th month, most infected cows will die.

Click on T. Symptoms return to top. For humans in good health, there are few serious symptoms associated with tapeworm infection. For both the T. The most common complaint has been the embarrassment and discomfort of the proglottids crawling out of the anus. Taeniasis infection may also compromise the immune system. Especially in young children, this may have a profound effect on their health. Diagnostic Tests return to top. Most patients do not know they are infected until a single proglottid crawls out of the anus or individual proglottids are spotted on the surface of the stool.

Taeniasis is then diagnosed by recovering eggs or gravid proglottids from the feces of the infected human host. However, identification at the species level can be made by the number of lateral uterine branches in the gravid proglottids and differing scolexes.

Compare the two in the picture. Management and Therapy return to top. Both T. Therapy is usually very successful and most cases are completely eradicated. However, if the proglottids reappear, retreatment is administered. Epidemiology return to top. Since the s, the rate of bovine cysticercosis has been at 0. Public Health and Prevention Strategie s return to top. Clinical Presentations return to top. Useful web links return to top. References return to top. Medical Parasitology.

Philadelphia: W. B Saunders, Warren, Kenneth. Immunology and Molecular Biology of Parasitic Infections. Boston: Blackwell Scientific, Home Page.

Taenia solium. History of Discovery. As the tapeworm grows in the human intestine, mature proglottis called gravid proglottis will be casted off out of the human body. Each gavid proglottids contains both male and female reproductive organs and houses 80 thousand eggs.

Each round egg measures micrometers and contains an embryo an oncosphere. Several steps can be taken to minimize T. Because egg can be viable from 16 days in untreated sewage to days in grass, cattle should not be allowed to graze on contaminated grounds.

Since human infection is acquired from consuming infected beef, it is advised that all beef products be inspected for cysticerci growths. Through cooking of the beef also provides complete protection.

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Taenia Saginata - Beef Tapeworm

The cestodes tapeworms Taenia saginata beef tapeworm and T. Taenia solium eggs can also cause cysticercosis. Taeniasis is the infection of humans with the adult tapeworm of Taenia saginata or Taenia solium. Humans are the only definitive hosts for T. Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment. Cattle T. A cysticercus can survive for several years in the animal.

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Taenia solium is the pork tapeworm , a tapeworm belonging to the cyclophyllid cestode family Taeniidae. It is found throughout the world and is most common in countries where pork is eaten. There are two forms. One is due to eating undercooked pork that contains the cysts and results in adult worms in the intestines. The other, known as cysticercosis , is due to eating food or water contaminated with feces from someone infected by the adult worms. The adult worm has humans as its main host and has a flat, ribbon-like body which is white and measures 2 to 3 metres long or more. Its tiny long attachment, the scolex , contains duodenum wall- suckers and a rostellum as organs of attachment.

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