Human taeniasis and cysticercosis in asia the lancet. Taenia solium and taenia saginata cause human taeniasis, i. The scolex is roughly quadrate, with a diameter of about 1mm, has four large, deeply cupped suckers and a conspicuous, rounded rostellum, armed with a double row of large and small hooks, numbering 22 to 36 and measuring 140 to 200 um and 100 to. The armed scolex may cause some inflammation of the intestinal wall, and rarely may penetrate the intestine, causing peritonitis. Several species of taenia also infect dogs and cats e. Taeniasis in humans is a parasitic infection caused by the tapeworm species taenia saginata beef tapeworm, taenia solium pork tapeworm, and taenia asiatica asian tapeworm. Infection with taenia solium adults is usually asymptomatic. Man is considered to be the definitive host and the pig is considered as the intermediate host. The main symptom is often the passage passive of proglottids. The entire body is called a strobila and may range in size from two to eight meters long. Adult worms are rarely pathogenic but the encysted larval stage cysticercus cellulosae of the worm caused a serious disease in human called cysticercosis. Pigs distribut ion cosmopolitan in areas where pork is eaten raw or under cooked. Difference between taenia solium and taenia saginata.
Taenia solium and taenia asiatica are acquired from ingestion of undercooked pork. Adult worm is flattened ribbonlike, without body cavity. One is due to eating undercooked pork that contains the. It is a retractable, conelike muscular structure that is located on the apical end of the scolex, and in most species is armed with hooks, the organs of attachment to the hosts intestinal wall. The head or scolex is the attachment organ, and has four suckers and a rostellum that may be armed with hooks t. 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. Taeniasis in humans is a parasitic infection caused by the tapeworm species. Taenia saginata is seen as a human health hazard and is recognized to cause serious economic losses to the. Infection follows consumption of undercooked beef or pork containing cysts. Context human taeniasis caused by the pork, taenia solium, or beef, t saginata, tapeworm arises after eating pork or beef contaminated with metacestodes, the larval stage of these parasites. Taenia saginata, the beef tapeworm, and taenia solium, the pork tapeworm, are the most common tapeworms affecting humans.
Cysticercosis is caused by the larval stage or metacestode of t. Humans are definitive hosts of two wellknown species of the taenia genus, taenia solium the pig tapeworm and taenia saginata the cattle tapeworm. By contrast with the beef tapeworm, pigs are required intermediate hosts, and infective. In addition, the rostellum of the taiwan taenia cysticercus is usually surrounded by two rows of rudimentary hooklets. Taenia solium infection taeniasis is an intestinal infection with adult tapeworms that follows ingestion of contaminated pork. Solium is that the latter contains a fleshy rostellum and a double crown row of precisely defined hooks, while the former lacks these structures. Taenia solium completes its life cycle in two different vertebrate hosts, man and pig. Apr 27, 2014 taenia solium induces premonition in the host. Rostellum present on the scolex of armed tapeworms. Rostellum definition of rostellum by medical dictionary. Cattle are the intermediate hosts, harboring the tissue cysticerci in. Four suckers and a rostellum with a crown of hooks.
A fully developed taenia solium may attain a length of 3. Treatment can be considered successful when no taenia ova are identified in stool 1 and 3 months after treatment. The worm is composed of a head or scolex that is approximately 1 mm in diameter and. Cysticercosis is usually asymptomatic unless larvae. It is worldwide in distribution the infection is common amongst those eating raw or insufficiently cooked measly pork. Parasitology taenia saginata beef tapeworm taeniasis. Taenia solium is the pork tapeworm, a tapeworm belonging to the cyclophyllid cestode family. Adult worm moves against the peristaltic movement in the hosts intestine. Taenia solium the adult taenia solium has a head scolex that consists of four suckers and a rostellum with a double crown of hooks, and unsegmented narrow neck, and a large body formed by several hundred proglottids figure 1. There is no known economic benefit of taenia saginata to humans. Each proglottid of taenia solium has reproductive organs from both sexes and. Pathology outlines taenia solium neurocysticercosis. One is due to eating undercooked pork that contains the cysts and results in adult worms in the intestines.
These pathogen safety data sheets, regulated under workplace hazardous materials information system whmis legislation, are produced for personnel working in the life sciences as quick safety reference material relating to infectious microorganisms. Due to its tape like appearance, it is called tapeworm. Taenia saginata beef tapeworm infection infectious. If you continue browsing the site, you agree to the use of cookies on this website. If the scolex is recovered, the 4 suckers and rostellum of hooklets of t. Globular in shape with 4 cup rostellum with 2 rows of. The life history of this asian taenia species was experimentally shown by fan1 in taiwan in 1988. The anterior end of the body of taenia has a knoblike scolex. Difference between taenia solium and taenia saginata learn. The scolex is smaller than the head of a pin about 1 mm in diameter with 4 cuplike muscular suckers having radial muscles, and an anterior round prominence, the rostellum having about 22 to 32 curved, chitinous hooks in two circles, the inner circle with larger hooks and outer circle with smaller ones. The body of taenia solium is dorsoventrally compressed, ribbon like and elongated. Taenia saginata, called the beef tapeworm, is a common intestinal infection worldwide.
The rostellar hooklets are shaped like daggers or arabian. However, this structure is rarely found in classical t. A fully developed taenia solium may attain a length of 35 metres. The scolex is roughly quadrate, with a diameter of about 1mm, has four large, deeply cupped suckers and a conspicuous, rounded rostellum, armed with a double row of large and small hooks, numbering 22 to 36 and measuring 140 to 200 um and 100 to 150 um, respectively, in length. Adult worms are rarely pathogenic but the encysted larval stage cysticercus cellulosae of the worm caused a serious disease in. May 14, 2014 video this entry was posted in biology in human welfare, intermediate em 1 and tagged cysticircosis, fertilization in t. Taenia solium taeniasis is less frequently symptomatic than taenia saginata taeniasis. 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. The restellum resembles the conventional figures of the sun, hence the name solium. The length of the body varies between 2 and 4 meters. Taenia solium commonly known as the pork tapeworm or the armed tapeworm. The main feature of this infection is the passage of proglottids in the stool. Pdf among taeniid tapeworms infecting humans through pork or beef, taenia solium linnaeus 1758 and taenia saginata goeze 1782 have already. Taenia solium is the pork tapeworm, a tapeworm belonging to the cyclophyllid cestode family taeniidae.
Taenia solium can also cause cysticercosis life cycle. It is found throughout the world and is most common in countries where pork is eaten. Proglottids may be cleared overnight in glycerol or stained with carmine or hematoxylin using published procedures if recovered, the scolex of t. Taeniasis is the infection of humans with the adult tapeworm of taenia saginata, t. Tim odempsey, in antibiotic and chemotherapy ninth edition, 2010. The most important health problem is infection by the cysticerci, cysticercosis. This disease usually causes only mild abdominal symptoms.
Taenia solium tapeworm infections can lead to cysticercosis, which is a disease that can cause seizures, so it is important seek treatment. Taenia saginata is more common, because it uses cattle as the secondary or intermediate host. Taeniasis refers to infection with the tapeworm form of one of three taenia species. Scolex has four suckers with a rostellum that has a double circle of alternating large and small hooks 2236 proglottid is smaller than t saginata and has 7 lateral branches off the central uterus. The head is provided with a rostellum armed with a double row of alternating large and small hooklets. The proglottids of taenia species can be identified by the number of uterine branches. Habit and habitat of taenia solium structure of taenia solium. People with taeniasis may not know they have a tapeworm infection. Adult worms may cause mild gastrointestinal symptoms or passage of a motile segment in the stool. Taenia solium, a human cestode parasite endemic throughout most of southeast asia, causes a number of public health and economic problems. In this article we will discuss about taenia solium.
Taeniasis is the parasitic infection of humans caused by adult tapeworm species. The parasite is endemic in bali due to a mix of cultural. People with taeniasis may not know they have a tapeworm infection because symptoms are usually mild or nonexistent. Taenia solium pork tapeworm recognised since biblical times the most dangerous taeniasis for human risk of cysticercosis cysticercus cellulose widely distribution, closely associated w pigs taenia solium morphology morphologically similar to, but smaller than, t. Cestodes taenia solium north dakota department of health. Taenia solium the common name for taenia solium is pork tapeworm i. The scolex bears four radially arranged suckers that surround the rostellum. The larval stages of the tapewormsm taenia solium and taenia saginata, can produce cysticercosis in humans. Body of taenia solium is ribbonlike, 23 meters long and consists of about 800900 segments known as proglottides fig. The size and shape of the strobila, scolex, rostellum and suckers, as well as the. Humans can become infected with these tapeworms by eating raw or undercooked beef t.
Humans are the only definitive hosts for these three species. Pdf morphologic descriptions of taenia asiatica sp. Taeniasiscysticercosis is included among the most relevant neglected zoonoses 1,2. The scolex has an armed rostellum bearing two rows of hooks. Solium is that the latter contains a fleshy rostellum and a double crown row of precisely defined hooks, while. Taeniasis with t solium can lead to neurocysticercosis and threaten others by accidental ingestion of eggs released from asymptomatic taeniasis patients. Taenia saginata beef tapeworm, taenia solium pork tapeworm or taenia asiatica asian tapeworm.
Note the four large suckers and rostellum containing. Taenia solium infection has been recognized since biblical times and the parasite life cycle has been identified by the 1850s. The most important feature of taenia solium taeniasis is the risk of development of cysticercosis. Distribution of taenia solium is worldwide and is most common in european countries. General recognition features scolex has four suckers with a rostellum that has a double circle of alternating large and small hooks 2236. Head is provided with a rostellum, with a double row of large and small teeths. Taenia solium pork tapeworm infection and cysticercosis. It is a flatribbon like tape worms that causes intestinal taeniasis. The head is not provided with any rostellum or hooklets. Taenia solium 1 lecture ii class cestoda 2 common features of class cestoda. Pig cow acts as intermediate host and harbour the larval stage. Taenia solium of humans causes porcine cysticercosis and human. The body is either grayish or yellowish or creamy white in colour. Laboratory diagnostic of taenia solium and taenia saginata.