The dwarf tapeworm or hymenolepis nana is found worldwide. Although the cells were unrecognizable as tapeworm tissue, immunohistochemical staining and. Seperti mesir, sudan, thailand, india, jepang, amerika selatan, eropa selatan, dan juga ditemukan di indonesia. Immunogenicity and phylogenetic relationship of tapeworm. Hymenolepis nana dwarf tapeworm infection infectious. Hymenolepis nana bilharz, 1851 ransom, 1901 1 dwarf tapeworm hymenolepis nana, also known as rodentolepis nana, vampirolepis nana, hymenolepis fraterna, and taenia nana is a cosmopolitan species though most common in temperate zones, and is one of the most common cestodes a type of intestinal worm or helminth infecting humans. It is the smallest and only cestode that parasites the human without any intermediate host.
Nov 06, 2016 alarcon islas dulce raque armenta carrillo ana sofia astorga hernandez gabriela galindo parada arantza gpe inda lopez enery jhoseline. The fact that an intermediate host is not required in the life cycle was determined in the late 1800s. Midle part of gravid proglottids, acetocarmine stain, x450. Hymenolepis nana has also been shown to infect lower primates and in such cases, humans appear to be the source of infection in a reverse zoonosis scenario. It is often referred to as the dwarf tapeworm due to its small size, 24 cm long and only 1 mm wide. Hymenolepis nana is within the scope of wikiproject animals, an attempt to better organize information in articles related to animals and zoology. The disease is a type of helminthiasis which is classified as a neglected tropical disease. It is the only cestode that does not require an intermediate host to develop into its infective stage. Eggs hatch in the duodenum, releasing oncospheres, which penetrate the mucosa and come to lie in lymph channels of the villi. Infeccion por hymenolepis diminuta en una estudiante. Hymenolepis microstoma dujardin, 1845 blanchard, 1891, the mouse bile duct tapeworm, is a rodentbeetlehosted laboratory model that has been used in research and teaching. On the inner membrane are two poles, from which 4 to 8 polar filaments spread out between the two membranes.
She remained well in spite of treatment, even though. Muehlenbachs a1, bhatnagar j, agudelo ca, hidron a, eberhard ml, mathison ba, frace ma, ito a, metcalfe mg, rollin dc, visvesvara gs, pham cd, jones tl, greer pw, velez hoyos a, olson pd, diazgranados lr, zaki sr. Its larvae migrate only within the gut wall, and its life span is relatively short 4 to 6 wk. Hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. Hymenolepis nana vs hymenolepis dimunota medical laboratories. Hymenolepis nana, the dwarf or dwarf mouse tapeworm, is a small tapeworm in humans, sometimes found in great numbers in the intestine. The dwarf tapeworm, hymenolepis nana, cancer cells linked. Development hymenolepis nana life cycle infection is acquired most commonly from eggs in the feces of another infected individual, which are transferred in food, by contamination. It once held two other scientific names including vampirolepis nana and taenia nana 4. The species name nana is derived from its small size which means dwarf of the adult worm. It has a cosmopolitan distribution and is thought to be the most common tapeworm. Malignant transformation of hymenolepis nana in a human. Humans, rodents most common tapeworm of humans in the world 1% rate of infection in the southern u. Hymenolepis nana, also known as dwarf tapeworm, is a cyclophyllidean tapeworm with embryonated eggs.
The scolex of hymenolepis nana shows suckers and an invaginated rostellum. Start this article has been rated as startclass on the projects quality scale. Diplacanthus manus, hymenolepis nana, hymenolepis murina. Generally none because worm is so small about 40 mm. Since isolates of hymenolepis nana infecting humans and rodents are morphologically indistinguishable. Similar topologies were developed when both neighborjoining and upgma. When eggs are ingested by an arthropod intermediate host various species of beetles and fleas may serve as intermediate hosts, they develop into cysticercoids, which can infect humans or rodents upon. Hymenolepis diminuta, also known as rat tapeworm, is a species of hymenolepis tapeworm that causes hymenolepiasis. Fairley, in mandell, douglas, and bennetts principles and practice of infectious diseases eighth edition, 2015. Hymenolepiasis is caused by two cestodes tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length and hymenolepis diminuta rat tapeworm.
Hymenolepis nana, a tiny intestinal tapeworm, is the most common human cestode. In this article we will discuss about hymenolepis nana. It requires only one host but can also cycle through two. Hymenolepis infection or infection with the dwarf tapeworm is found worldwide. Apr 20, 2015 hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus hymenolepis and species nana.
Examination of the giemsa stained blood film revealed many intraerythrocytic parasites. Pdf neoplasms occur naturally in invertebrates but are not known to develop in tapeworms. The fine structure of the envelopes surrounding hatched and unhatched oncospheres of hymenolepis nana. Hymenolepis nana definition of hymenolepis nana by medical. Malignant transformation of hymenolepis nana in a human host to the editor. Pdf hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm found in the intestines of broad range of dogs, rats and humans. When eggs are ingested by an arthropod intermediate host various species of beetles and fleas may serve as intermediate hosts, they develop into cysticercoids, which can infect humans or rodents upon ingestion and develop into adults in the small intestine. Hymenolepis definition of hymenolepis by medical dictionary. Pdf malignant transformation of hymenolepis nana in a human.
Heavy hymenolepis nana infection possibly through organic. Eggs of hymenolepis nana are immediately infective when passed with the stool and cannot survive more than 10 days in the external environment. Infeksi dari hymenolepis nana ditemukan banyak terdapat pada orangorang dengan sanitasi yang buruk dan padat. Infection is most common in children, in persons living in institutional settings, and in people who live in areas where sanitation and personal hygiene is inadequate. Hymenolepis nana is the smallest of all tapeworms found in humans and is appropriately described as the dwarf tapeworm. It is the first known case of a person becoming ill from cancer cells that arose in a parasite in this case, hymenolepis nana, the dwarf tapeworm.
Hymenolepis rodentolepis nana is the most common cestode of humans, particularly in young children. This cestode belongs to a large family known as hymenolepididae. The dwarf tapeworm, hymenolepis nana, cancer cells linked to. Description of hymenolepis microstoma nottingham strain. How to get rid of muscle knots in your neck, traps, shoulders, and back duration. It has slightly bigger eggs and proglottids than h.
It is small and measures up to 2540 mm in length by one mm in diameter. If larvabearing eggs enter the human gastrointestinal tract, the oncospheres are released into the duodenum and attatch to the villi, where each develops into a cysticercoid. Hymenolepis nana bilharz, 1851 ransom, 1901 1 dwarf tapeworm hymenolepis nana, also known as rodentolepis nana, vampirolepis nana, hymenolepis fraterna, and taenia nana is a cosmopolitan species though most common in temperate zones, and is one of the most common cestodes a type of intestinal worm or helminth infecting humans, especially children. Seperti mesir, sudan, thailand, india, jepang, amerika selatan. Transactions of the royal society of tropical medicine and hygiene 101. Hymenolepis nana bilharz, 1851 ransom, 1901 1 dwarf tapeworm hymenolepis nana, also known as rodentolepis nana, vampirolepis nana, hymenolepis fraterna, and taenia nana is a. Rodents are the primary definitive hosts, and grain beetles, fleas, or other insects feed on contaminated rodent droppings as intermediate. Although the dwarf tapeworm infection rarely causes symptoms, it can be misdiagnosed for pinworm infection. Malignant transformation of hymenolepis nana in a human host. Hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus hymenolepis and species nana. A polymerasechainreaction pcr assay targeting eukaryotes identified hymenolepis nana dna. Alternative names are dwarf tapeworm infection and rat tapeworm infection. Biologia simplificada com emerson inacio 6,583 views. It has a cosmopolitan distribution and is thought to be the most common tapeworm throughout the world.
He recovered a countless number of them at a postmortem on a boy who had died of meningitis. For precise diagnosis of the species, molecular techniques such as pcr and rflp of. Hymenolepiasis is infestation by one of two species of tapeworm. Hymenolepiasis is the term when a human is infected with either h. Given the widespread distribution and medical implication of members of the genus hymenolepis, specific identification of the aetiological agent becomes imperative. Later, morphological characteristics were used for taxonomy identification and h. Hymenolepis nana pathogen intestinal cestode organism. Two of these show identical specificity while the third exhibits common as well as uncommon. This infection does not require an intermediate host and infection can occur directly from one infected person to another by fecaloral transmission. Although the cells were unrecognizable as tapeworm tissue, immunohistochemical staining and probe. The authors cite some ear lier cases as examples of proliferating. Introduction the dwarf tapeworm is a species of tapeworm that is classified in the platyhelminthes phylum. Ingestion of food contaminated with feces human or rodent.
Hymenolepiasis is primarily caused by the cestode tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length. Malignant transformation of hymenolepis nana in a human host article pdf available in new england journal of medicine 37319. It is most often seen in children in countries in which sanitation and hygiene are inadequate. Hymenolepis nana adalah cestoda yang tersebar di seluruh dunia baik kosmopolit di daerah beriklim tropis maupun sedang.
Hymenolepis nana is also known as the dwarf tapeworm. Nov 05, 2015 malignant transformation of hymenolepis nana in a human host. Hymenolepiasis is caused by two cestodes tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length and hymenolepis diminuta rat tapeworm, adults measuring 20 to 60 cm in length. Hymenolepis nana has been called the dwarf tapeworm and has a worldwide distribution. The aim of this study was to determine the prevalence in a health area of southern spain. Hymenolepis nana introduction hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. The fact that an intermediate host is not required in. Hymenolepis nana is an intestinal cestode causing tapeworm infection in humans with a worldwide distribution. The dwarf tapeworm was found in man for the first time by bilharz, in cairo, egypt, in 1851. Hymenolepis nana is an exception among the cestodes, as it can develop directly in the same host. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents. Nov 22, 2015 hymenolepiasis is the term when a human is infected with either h. Hymenolepis worms live in the intestines of rats and are common in warm climates, and are generally found in the feces of rats, which are consumed by their secondary hostsbeetles.