The life cycle of T. solium is indirect. It passes through pigs or other animals, as intermediate hosts, into humans, as definitive hosts. Life Cycle. Around and around we go! The life cycle of the beef tapeworm is a bit complicated and has some essential steps to complete its cycle. The process of. Beef tapeworm (Taenia saginata) life cycle, symptoms, diagnosis and treatment ( pictures included). Beef tapeworm causes taeniasis (parasitic disease).
|Country:||Republic of Macedonia|
|Published (Last):||26 November 2009|
|PDF File Size:||5.52 Mb|
|ePub File Size:||9.31 Mb|
|Price:||Free* [*Free Regsitration Required]|
The cestodes Taenia saginata beef tapewormT. Taenia solium can also cause cysticercosis.
Taeniasis is the infection of humans with the adult tapeworm of Taenia saginataT. Humans are the only definitive hosts for these three species.
Eggs or gravid proglottids are passed with feces ; the eggs can survive for days to months in the environment.
A cysticercus can survive for several years in the animal. Humans become infected by ingesting raw or undercooked infected meat.
Taenia solium – Wikipedia
In the human intestine, the cysticercus develops over 2 months into an adult tapeworm, which can survive for years. The adult tapeworms attach to the small intestine by their scolex and reside in the small intestine.
Length of adult worms is usually 5 m or less for T. The adults produce proglottids which mature, become gravid, detach from the tapeworm, and migrate to the anus or are passed in the stool approximately 6 per day.
The eggs contained in the gravid proglottids are released after the proglottids are passed with the feces. Taenia saginata and T.
Pathology Outlines – Taenia saginata
Taenia solium is more prevalent in poorer communities where humans live in close contact with pigs and eat undercooked pork.
Taenia saginata taeniasis produces only mild abdominal symptoms. The most striking feature consists of the passage active and passive of proglottids. Occasionally, appendicitis or cholangitis can result from migrating proglottids.
Taenia solium taeniasis is less frequently symptomatic than Taenia saginata taeniasis. The main symptom is often the passage passive of proglottids. The most important feature of Taenia solium taeniasis is the risk of development of cysticercosis. Iodine-stained wet mount of a Cycel sp.
Taenia Saginata – Beef Tapeworm
Four hooks can easily be seen in this image. Note the four large suckers and rostellum containing two rows of hooks. Note the four large suckers and lack of rostellum and rostellar hooks. Mature proglottid of T. Cross-section of a proglottid of Taenia sp.
Note the thick outer tegument and the loose parenchyma filling the body. Calcareous corpuscles red arrowscharacteristic of the cestodes, can be seen in the parenchyma. Eggs blue arrows can also be seen. Higher magnification of the image in Figure B, showing a close-up of the eggs. Note the characteristic striations, typical for the taeniids.
Not visible in these images are the hooks commonly seen in cestode eggs. Close-up of a cross-section of a Taenia sp. Image courtesy of the Michael E. Medical Center in Houston, TX. Image courtesy of Ameripath. Taenia saginata adult worm. The adult in this image is approximately 4 meters in length. Microscopic identification of eggs and proglottids in feces is diagnostic for taeniasis, but is not possible during the first 3 months following infection, prior to development of adult tapeworms.
Repeated examination and concentration techniques will increase the likelihood of detecting light infections. Nevertheless, identification of Taenia is not possible if solely based on microscopic examination of eggs, because all Taenia species produce eggs that are morphologically identical. Eggs of Taenia spp. Microscopic identification of gravid proglottids or, more rarely, examination of the scolex allows species determination.
Taenia saginata has primary lateral uterine branches, while T. Visualization of the branches can be improved by clearing the specimen in lactophenol followed by India ink injection into the lateral genital pore. The procedure is as follows:.
May prove useful especially in the early invasive stages, tqenia the eggs and proglottids are not yet apparent in the stools.
Morphologic comparison with other intestinal parasites. Treatment information for taeniasis can be found at: DPDx is an education resource designed for health professionals and laboratory scientists.
For an overview including prevention and control visit www. Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content.
Enter Email Address What’s this? Recommend on Facebook Tweet Share Compartir. Life Cycle Taeniasis is the infection of humans with the adult tapeworm of Taenia saginataT. Geographic Distribution Taenia saginata and T. Image Gallery Taenia spp. The eggs of Taenia spp. The eggs measure micrometers in diameter and are radially-striated. The internal oncosphere contains six refractile hooks.
The scolex of T. There are usually 13 hooks of each size.
Gravid proglottids are longer than wide and the two species, T. Cross-sections of Taeniw spp. Adults can reach a length of meters, but the scolex is only millimeters in diameter. Laboratory Diagnosis Laboratory Diagnosis Microscopy Microscopic identification of eggs and proglottids in feces is diagnostic cycld taeniasis, but is not possible during the first 3 months following infection, prior to development of adult tapeworms.
Antibody detection May prove useful especially in the early invasive stages, when the eggs and proglottids are not yet apparent in the stools. Treatment Information Treatment Information Treatment information for taeniasis can be found at: Get Email Updates To receive email updates about this page, enter your email address: December 18, Page last updated: December 18, Content source: Sainata to a non-federal site does not constitute an endorsement by HHS, CDC or any of its employees of the sponsors or the information and products presented on the site.