Intact gravid proglottids are shed off in groups of four or five. Difference between taenia solium and taenia saginata learn. May 14, 2014 taenia solium completes its life cycle in two different vertebrate hosts, man and pig. Taenia saginata, taenia solium and taenia asiatica beef, pork and asian tapeworms, respectively are parasitic flatworms of major public health.
It is worldwide in distribution the infection is common amongst those eating raw or insufficiently cooked measly pork. Taenia solium, taenia saginata, cestodos, coproantigenos. The restellum resembles the conventional figures of the sun, hence the name solium. Jan 06, 2020 life cycle of taenia saginata and taenia solium humans are the only definitive hosts for taenia saginata and taenia solium. Taeniasis is the parasitic infection of humans caused by adult tapeworm species. Taenia solium taeniosiscysticercosis one health commission. Cysticercosis is usually asymptomatic unless larvae. Full text is available as a scanned copy of the original print version. Taenia solium pork tapeworm infection and cysticercosis. The zoonotic tapeworms taenia saginata and taenia solium, are known as the beef tapeworm and pork tapeworm, respectively, depending on their intermediate host.
Definitive host man stage leaving the body gravid proglottids, occasional embryonated eggs intermediate host pigs and man infectious stage for the definitive host infectious eggs for cysticercosis, cysticerci for tapeworm infection. Adult taenia solium scolex taenia solium scolex suckers hooks photo. Comparative genomics reveals adaptive evolution of asian. Cysticercosis is the disease associated with the development of the larval form cysticercus of the pork tapeworm, taenia solium, within an intermediate host.
Man as the intermediate host of the taenia solium br med j 1926. Fao manual on meat inspection for developing countries. Taeniasiscysticercosis fact sheet world health organization. Humans are the definitive hosts for taenia solium the pork tapeworm and t. Human infection by the pork tapeworm taenia solium affects more than 50 million people worldwide, particularly in underdeveloped and developing countries. Three parasite species cause taeniasis in humans, taenia solium, taenia saginata. The pig as an intermediate host for taiwan taenia infection. The adults are 35m in length, have a scolex, and several rows of hooks. Taeniasis, cysticercosis, taenia solium, taenia saginata, cestodes, coproantigens. Start studying cestodes taenia saginata and taenia solium. Overview of tapeworm infections infectious diseases. Though it was the asiatic lions range which would have overlapped with that of the tiger, rather than the african lion, two caspian tigers in southwestern tajikistan harbored a few tapeworms in their. Humans act as the definitive host and harbour the adult tapeworm in the small intestine. Among them 359 were caused by taenia saginata, three by t.
When they settle to form cysts, clinical symptoms of cysticercosis appear. Taenia solium, the pork tapeworm, is a cestode parasite that causes two different and highly distinct forms of infection in the human host. Globular in shape with 4 cup rostellum with 2 rows of. The cestodes tapeworms taenia saginata beef tapeworm and t. Many species appear to have two scientific names because the larval stages in herbivores were often named as cysticercus, strobilocercus or coenurus spp. Overview of tapeworm infections infectious diseases merck. It is found throughout the world and is most common in countries where pork is eaten.
General recognition features can be 10 meters long though usually 25 meters 2000 proglottids 1 cm long with 12 being gravid proglottids have 1520 lateral branches from the uterus and a lateral genital pore scolex has 4 suckers with a slight apical depression and no hooklets. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Taenia saginata is one of two agents responsible for human taeniasis, the other being. Since a patient can present with symptoms of either taeniasis or cysticercosis specifically, neurocysticercosis, there are two separate protocols. Small intestine definitive host muscle intermediate host what is the predilection site of taenia solium in both the. Designing a minimal intervention strategy to control. It is a major public health problem because of the high proportion of seizure cases in endemic areas which are caused by nervous system infection with the larval stage neurocysticercosis, ncc garcia and del brutto, 2005. It completes its life cycle in two different vertebrate hosts, man and pig. Since a patient can present with symptoms of either taeniasis or cysticercosis specifically, neurocysticercosis, there are two separate protocols listed below. Taenia saginata, known as the beef tapeworm, is transmitted to humans in the form of infectious larval cysts found in the meat of cattle, which serve as the parasites usual intermediate host. Some experts postulate that if an adult tapeworm is present in the intestine, gravid proglottids tapeworm segments may be passed retrograde from the intestine to the stomach, where oncospheres immature form of the parasite enclosed. After ingestion, the eggs mature into metacestodes, which are infective larvae capable of. A third species, taenia asiatica, the asian tapeworm, although genetically closest to t. Pig natural intermediate host, man accidental intermediate host and very exceptionally the dog.
Pigs distribut ion cosmopolitan in areas where pork is eaten raw or under cooked. Both have a relatively simple life cycle, alternating between man and the intermediate host. Difference between taenia solium and taenia saginata. Taenia solium taeniasis cysticercosis diagnostic tools. One is due to eating undercooked pork that contains the cysts and results in adult worms in the intestines. Taenia solium completes its life cycle in two different vertebrate hosts, man and pig. Cestodes taenia saginata and taenia solium quizlet. A pair of taenia proglottids, dried and resembling sesame seeds, each containing hundreds of eggs. Sep 22, 2016 taenia saginata, taenia solium and taenia asiatica beef, pork and asian tapeworms, respectively are parasitic flatworms of major public health and food safety importance.
Man as the intermediate host of the taenia solium the bmj. A longstanding puzzle has been that adult taeniid tapeworms expelled from people in asia seem to be taenia saginata, the beef tapeworm, although these people eat pork the host for t solium rather than beef. Pdf file of the complete article 291k, or click on a page image below to browse page by page. Man is considered to be the definitive host and the pig is considered as the intermediate host. Taenia solium linnaeus current topics in medicinal chemistry. Except the adult, various stages of its life history are passed in the body of secondary host.
Taeniasis is the infection of humans with the adult tapeworm of taenia saginata or taenia solium. Taenia solium infection taeniasis is an intestinal infection with adult tapeworms that follows ingestion of contaminated pork. The results of this study indicate that young pigs are good intermediate hosts for taiwan taenia and that the sem pig is a satisfactory host for experimental studies with this tapeworm. In the americas, paho has released a manual on the practical. Porcine cysticercosis pig intermediate host search strategy this seminar is based on papers published in the past 15 years in english, spanish, or portuguese selected from medlineby use of the pubmed system with keywords cysticercosis,neurocysticercosis,taenia solium. Humans may also become intermediate hosts in the life cycle of t. Taenia solium is the pork tapeworm, a tapeworm belonging to the cyclophyllid cestode family taeniidae. Man is the primary or definitive host, the secondary host for t. Greenwood, in medical microbiology eighteenth edition, 2012. By contrast with the beef tapeworm, pigs are required intermediate hosts, and infective.
Globular in shape with 4 cup rostellum with 2 rows of hooks. The lifecycle begins with either the gravid proglottids or free eggs embryophores with. Taenia solium is the socalled pork tapeworm belonging to cyclophyllid cestodes in the family taeniidae. However, humans may also act as intermediate hosts for t.
An ovum of taenia species epidemiology and prevention prevention involves the use of good sanitary techniques, personal hygiene measures and adequate cooking of beef and pork products. Life cycle differences include possible autoinfection route in t. Taenia saginata beef tapeworm, taenia solium pork tapeworm or taenia asiatica asian tapeworm. Human infection is acquired by eating raw or undercooked beef or pork containing the encysted larval stage, the. The life history of this asian taenia species was experimentally shown by fan1 in taiwan in 1988. Solium scolex gravid proglottid taenia solium uterine branches number less than 10 per side embryonated, infectious taeniid eggs egg envelope hexacanth larva hooklets cannot determine the. Definitive host man adults found attached to the middle third of the small intestine stage leaving the body gravid proglottid that actively migrate and pass embryonated eggs intermediate host cattle infectious stage for the definitive host cysticercus infected meat. Humans are the definitive and only hosts of the tapeworm stage. Human taeniasis and cysticercosis in asia the lancet. Taenia serialis is a parasite of dogs and foxes which has rabbits as the intermediate host.
The first page of the pdf of this article appears above. Taenia asiatica, the asian taenia, has humans as definitive hosts, and pigs and rarely cattle as intermediate hosts taenia bubesei was known to infect both the lion and tiger. Taenia solium pork tapeworm humans are definitive host pigs are the most common intermediate host many animals including humans can harbor cysticerciusually in striated muscle, but often in other tissuesorgans neurocysticercosis common in latin america in n. Get a printable copy pdf file of the complete article 291k, or click on a page image below to browse page by page. Read this article to learn learn about the structure and life cycle of taenia. Cestodes taenia solium north dakota department of health. Articles man as the intermediate host of the taenia solium. Parasitology taenia saginata beef tapeworm taeniasis. Taenia solium, the pork tapeworm of man, as adult lives in the intestine of man leading an endoparasitic life. Adult worms may cause mild gastrointestinal symptoms or passage of a motile segment in the stool. The larval stage develops in the pig, the intermediate host, following ingestion of tapeworm eggs. The structure and life cycle of taenia with diagram. The areas with the highest prevalence up to 27% are in central asia, the. Taeniasis or taeniosis refers to infestation of the intestinal tract by the adult tapeworm fig.
In the definitive, human, host infections with the adult stage of taenia spp. If the human is the intermediate host from ingesting eggs from water they can go on to develop cysts in their cns describe the life cycle of taenia ovis. Taenia saginata, the beef tapeworm, is much more prevalent than the related t. For human cysticercosis, dirty hands are tqenia to be the primary cause, and especially common among food handlers. Pig natural intermediate host, man accidental intermediate host and very exceptionally the dog definitive host. It is also called tapeworm as the shape of the body is like a tape. Taenia solium the common name for taenia solium is pork tapeworm i. Taenia solium eggs can also cause cysticercosis life cycle. Taenia solium, the pork tapeworm, is endemic in most developing countries as well as in developed nations with a high influx of immigrants from endemic areas fig. What is the predilection site of taenia ovis in both the intermediate host and the definitive host. Animals can be intermediate hosts for these five species as well as for t. These results were similar to other studies with different geographic strains of the t. As intermediate host, humans acquire tissue infection of cysticerci by ingestion of t. Cestodes taenia saginata and taenia solium flashcards.
990 1591 1292 1592 1604 71 137 929 1174 1575 1146 477 435 390 1101 662 721 407 1468 948 438 1406 359 712 92 1524 380 1362 1337 385 428 805 212