Although the dwarf tapeworm infection rarely causes symptoms, it can be misdiagnosed for pinworm infection. On the inner membrane are two poles, from which 4 to 8 polar filaments spread out between the two membranes. It has a cosmopolitan distribution and is thought to be the most common tapeworm. Nov 05, 2015 malignant transformation of hymenolepis nana in a human host. Examination of the giemsa stained blood film revealed many intraerythrocytic parasites. Hymenolepiasis is infestation by one of two species of tapeworm. Infeccion por hymenolepis diminuta en una estudiante. Here, we present a case of a renal transplant recipient who presented with abdominal pain and developed diarrhea. Generally none because worm is so small about 40 mm. Humans, rodents most common tapeworm of humans in the world 1% rate of infection in the southern u. Two of these show identical specificity while the third exhibits common as well as uncommon. 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, eropa selatan, dan juga ditemukan di indonesia. Hymenolepis nana is an exception among the cestodes, as it can develop directly in the same host.
Hymenolepis definition of hymenolepis by medical dictionary. This infection does not require an intermediate host and infection can occur directly from one infected person to another by fecaloral transmission. Infeksi dari hymenolepis nana ditemukan banyak terdapat pada orangorang dengan sanitasi yang buruk dan padat. This cestode belongs to a large family known as hymenolepididae. Hymenolepis nana, the dwarf tapeworm, is the smallest and a common tapeworm in humans worldwide. The species name nana is derived from its small size which means dwarf of the adult worm. Malignant transformation of hymenolepis nana in a human host.
Hymenolepis nana adalah cestoda yang tersebar di seluruh dunia baik kosmopolit di daerah beriklim tropis maupun sedang. Malignant transformation of hymenolepis nana in a human. The dwarf tapeworm was found in man for the first time by bilharz, in cairo, egypt, in 1851. Eggs of hymenolepis nana are immediately infective when passed with the stool and cannot survive more than 10 days in the external environment. Ingestion of food contaminated with feces human or rodent. The dwarf tapeworm, hymenolepis nana, cancer cells linked to. Hymenolepis microstoma dujardin, 1845 blanchard, 1891, the mouse bile duct tapeworm, is a rodentbeetlehosted laboratory model that has been used in research and teaching. She remained well in spite of treatment, even though. He recovered a countless number of them at a postmortem on a boy who had died of meningitis.
Hymenolepis nana dwarf tapeworm infection infectious. It is most often seen in children in countries in which sanitation and hygiene are inadequate. Diplacanthus manus, hymenolepis nana, hymenolepis murina. In this article we will discuss about hymenolepis nana. Malignant transformation of hymenolepis nana in a human host article pdf available in new england journal of medicine 37319.
Hymenolepiasis is the term when a human is infected with either h. 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. It requires only one host but can also cycle through two. Pdf neoplasms occur naturally in invertebrates but are not known to develop in tapeworms. Biologia simplificada com emerson inacio 6,583 views. The fine structure of the envelopes surrounding hatched and unhatched oncospheres of hymenolepis nana. Hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. In 1906, stiles identified an identical parasite with a rodent host and named it hymenolepis fraterna. 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. Start this article has been rated as startclass on the projects quality scale. Hymenolepis diminuta, also known as rat tapeworm, is a species of hymenolepis tapeworm that causes hymenolepiasis. Eggs hatch in the duodenum, releasing oncospheres, which penetrate the mucosa and come to lie in lymph channels of the villi. Although the cells were unrecognizable as tapeworm tissue, immunohistochemical staining and probe.
Seperti mesir, sudan, thailand, india, jepang, amerika selatan. The leaves are alternately arranged on the branches but the lower parts of the stem and branches are leafless. Pdf malignant transformation of hymenolepis nana in a human. The dwarf tapeworm, hymenolepis nana, cancer cells linked. For precise diagnosis of the species, molecular techniques such as pcr and rflp of. It once held two other scientific names including vampirolepis nana and taenia nana 4. 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. Hymenolepis nana has been called the dwarf tapeworm and has a worldwide distribution.
Introduction the dwarf tapeworm is a species of tapeworm that is classified in the platyhelminthes phylum. 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. Nov 06, 2016 alarcon islas dulce raque armenta carrillo ana sofia astorga hernandez gabriela galindo parada arantza gpe inda lopez enery jhoseline. The disease is a type of helminthiasis which is classified as a neglected tropical disease. 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. Fairley, in mandell, douglas, and bennetts principles and practice of infectious diseases eighth edition, 2015. The dwarf tapeworm or hymenolepis nana is found worldwide. The aim of this study was to determine the prevalence in a health area of southern spain. Hymenolepis rodentolepis nana is the most common cestode of humans, particularly in young children. It is the smallest and only cestode that parasites the human without any intermediate host. Hymenolepis nana is also known as the dwarf tapeworm. 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. Rodents are the primary definitive hosts, and grain beetles, fleas, or other insects feed on contaminated rodent droppings as intermediate. Midle part of gravid proglottids, acetocarmine stain, x450.
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. Immunogenicity and phylogenetic relationship of tapeworm. The adult worm resides in the ileal portion of the small intestine. Hymenolepis nana is within the scope of wikiproject animals, an attempt to better organize information in articles related to animals and zoology. 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. Hymenolepis nana is an intestinal cestode causing tapeworm infection in humans with a worldwide distribution. It is the only cestode that does not require an intermediate host to develop into its infective stage. Description of hymenolepis microstoma nottingham strain. Apr 20, 2015 hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus hymenolepis and species nana. Hymenolepis nana, the dwarf or dwarf mouse tapeworm, is a small tapeworm in humans, sometimes found in great numbers in the intestine. Given the widespread distribution and medical implication of members of the genus hymenolepis, specific identification of the aetiological agent becomes imperative. 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. Hymenolepis nana pathogen intestinal cestode organism. 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 nana, also known as dwarf tapeworm, is a cyclophyllidean tapeworm with embryonated eggs. Although the cells were unrecognizable as tapeworm tissue, immunohistochemical staining and. It is often referred to as the dwarf tapeworm due to its small size, 24 cm long and only 1 mm wide. 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. Similar topologies were developed when both neighborjoining and upgma. Nov 22, 2015 hymenolepiasis is the term when a human is infected with either h.
Transactions of the royal society of tropical medicine and hygiene 101. Hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus hymenolepis and species nana. Hymenolepiasis is primarily caused by the cestode tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length. It has slightly bigger eggs and proglottids than h. 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. Hymenolepis nana is the most common tapeworm in humans. Hymenolepis nana vs hymenolepis dimunota medical laboratories. A 44 year old man was admitted to the hospital following a twoweek history of low grade fever, malaise, and anorexia. Heavy hymenolepis nana infection possibly through organic. Later, morphological characteristics were used for taxonomy identification and h.
How to get rid of muscle knots in your neck, traps, shoulders, and back duration. 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 nana definition of hymenolepis nana by medical. Hymenolepis nana introduction hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. It has a cosmopolitan distribution and is thought to be the most common tapeworm throughout the world. The fact that an intermediate host is not required in the life cycle was determined in the late 1800s. Alternative names are dwarf tapeworm infection and rat tapeworm infection. It is small and measures up to 2540 mm in length by one mm in diameter. The scolex of hymenolepis nana shows suckers and an invaginated rostellum. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents. Hymenolepis nana is the smallest of all tapeworms found in humans and is appropriately described as the dwarf tapeworm.
Malignant transformation of hymenolepis nana in a human host to the editor. The fact that an intermediate host is not required in. Its larvae migrate only within the gut wall, and its life span is relatively short 4 to 6 wk. A polymerasechainreaction pcr assay targeting eukaryotes identified hymenolepis nana dna.
873 1022 417 613 1610 1042 773 1025 295 260 1099 1645 449 549 1664 983 234 1035 1364 570 1589 1411 1286 383 440 1162 1613 199 1435 812 482 798 1246 1352 1419 904 857 1095 1180 713 1084 1013 766 332 474 304 236