explain the life cycle of taenia solium?

Question

in human phase and pig phase

Answer 1

This infection is caused by ingestion of eggs shed in the feces of a human tapeworm carrier. Pigs and humans become infected by ingesting eggs or gravid proglottids. Humans are infected either by ingestion of food contaminated with feces containing eggs, or by autoinfection. In the latter case, a human infected with adult T. solium can ingest eggs produced by that tapeworm, either through fecal contamination or, possibly, from proglottids carried into the stomach by reverse peristalsis.

Once eggs are ingested, oncospheres hatch in the intestine, invade the intestinal wall, and migrate to striated muscles, as well as the brain, liver, and other tissues, where they develop into cysticerci. In humans, cysts can cause serious sequelae if they localize in the brain, resulting in neurocysticercosis. The parasite life cycle is completed, resulting in human tapeworm infection, when humans ingest undercooked pork containing cysticerci.

Cysts evaginate and attach to the small intestine by their scolex. Adult tapeworms develop, (up to 2 to 7 m in length and produce less than 1000 proglottids, each with approximately 50,000 eggs) and reside in the small intestine for years .

Answer 2

Taenia Life Cycle

Answer 3

Taenia Solium Life Cycle

Answer 4

To summarise: 1. Cloud of hydrogen in space (there are lots of them) 2. Non-uniformities in the density of the cloud will be increased by gravity - so any patches where the gas is thickest will attract more gas due to the gravitational pull 3. As the dense patches get denser, they get hot. The hydrogen gas is under very great pressure due to it's own weight. The pressure gets so high that hydrogen atoms get pushed together so hard they fuse and become helium. The process is called nuclear fusion and produces a considerable amount of energy in the form of heat and light. 4. The new star has entered a phase called 'main sequence'. Our sun is in this phase. It can last from just a few million to billions of years, depending on the size of the star. The bigger the star, the shorter time it has. The main sequence is stable. The energy released by the nuclear reactions cancels out gravity and prevents collapse. This continues until just about all the hydrogen has been fused into helium. 5. When the star runs out of hydrogen, it leaves the main sequence and is no longer stable. As the fusions reactions begin to wind down, gravity is then able to collapse the star further under its own weight. At the increased pressure, helium fusion may occur, producing heavier elements. This buys the star a little more time. 6. Eventually no more nuclear fusions can occur. What happens next depends on the size of the star. Giant ones will explode in a supernova. Smaller ones (like our sun) will become a red giant, and then a white dwarf and slowly fade away.

Answer 5

help

Definition of Taenia solium

Taenia solium: The pork tapeworm. Contracted from eating undercooked or measly pork (pork infected with the larval forms of the tapeworm). Taenia solium causes two different diseases -- taeniasis and cysticercosis.

Taeniasis develops when the adult tapeworm infests the human intestine. The worm can grow to be 3-6 feet (0.9-1.8 m) long there. It usually causes no symptoms but the host becomes a continuous source of taenia eggs in the feces which may contaminate food.

Cysticercosis develops when people (or pigs) eat food contaminated with taenia eggs. The eggs cross the digestive tract, enter the circulation, and lodge in the tissues (usually the brain or muscles).

The life cycle proceeds as humans ingest undercooked pork containing the cysticercus (larva); the worm emerges and anchors in the intestinal wall, and the worm grows and becomes a new and continuous source of contamination.

Also known as the armed tapeworm, solitary tapeworm and the measly tapew

Answer 6

Life Cycle
< Infection occurs by ingesting cysticerci in undercooked pork.

< The cysticercus evaginates in the small intestine.

< Adults attach to the intestinal wall with an armed scolex. Worms mature in several weeks and begin shedding gravid proglottids. Adults have < 1000 proglottids and are up to 7 meters in length. Each proglottid may contain 50,000 eggs.

< Gravid proglottids detach and are passed in the feces or actively migrate out the anus (~6/day). Indivdual proglottids are muscular and crawl in a "worm-like" fashion. Proglottids dry up and eggs are released in the environment. Eggs may also be passed out directly with the feces.


Symptoms/Pathology

Infection with Taenia solium adults is usually asymptomatic. The armed scolex may cause some inflammation of the intestinal wall, and rarely may penetrate the intestine, causing peritonitis.

The most important health problem is infection by the cysticerci, cysticercosis. Eggs that pass through the stomach (either from ingestion or reverse peristalsis) hatch in the small intestine, penetrate the intestinal wall and are distributed throughout the body in the circulatory system. The most common sites of infection are the skeletal muscle and brain.

Cysticerci in the muscle may cause spasms, weakness and pain. Calcification of the cysticercus may occur after 1 year and significantly reduces the pathology.
Cysticerci in the brain cause the most severe pathology, including headaches, local paralysis, optic disturbances, and possibly death. Calcification in the brain may not occur and inflammation from dying cysticerci can be exteremtly damaging.


The life cycle of T. solium is represented graphically at the url below. It consists of six main steps:
http://www.stanford.edu/class/humbio103/ParaSites2006/Taenia_solium/Life%20Cycle.html

Also
http://www.fao.org/ag/AGAinfo/subjects/en/health/diseases-cards/cards/Taenia-solium.jpg
and
http://www.cdfound.to.it/img/ts1.gif

Answer 7

It would seem that using a search engine to type in those words would actually be LESS work than submitting a question here. If you have access to this site, you also have access to search sites.

Think about it.

Answer 8

oof! this answer is very long. go any paracytology book or go any zoology book.