Pdf hymenolepis nana and hymenolepis diminuta are globally widespread zoonotic cestodes. A shell full of polar thicknesses protects the embryo. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents life cycles. Morfologia ciclo biologico introducao hymenoleps diminuta hymenolepis nana hymenoleps nana e hymenoleps diminuta ciclo biologico ciclo biologico morfologia. Hymenoleps nana e hymenoleps diminuta by nayara rufino on prezi.
Hymenolepiasis is more frequent among children, and most human infections remain asymptomatic and selflimited. Pdf the aim of this survey was to study two hymenolepididae species in urban rodents, rattus rattus and rattus norvegicus, and to analyse. Hymenolepis diminuta is a tapeworm that can cause intestinal infection in humans. Hymenolepis diminuta has a cosmopolitan distribution with prevalence up to 1% in parts of india. 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. Headache, dizziness, sleep and behavior disturbances are frequent. The difference between the eggs is used for diagnostic purposes. Larval and adult beetles but optional larval stage, cysticercoid, can develop in d. In the southeastern usa, as many as 1% of young schoolchildren are infected. He recovered a countless number of them at a postmortem on a boy who had died of meningitis. We encountered a patient with heavy hymenolepis nana infection. The oncosphere is surrounded by 3 layers the capsule, the outer envelope and the. Cdc hymenolepis resources for health professionals.
Hymenolepis nana is also known as the dwarf tapeworm. The parasite is commonly known as the rat tapeworm. In this article we will discuss about hymenolepis nana. Himenolepiase causas, sintomas, diagnostico e tratamento. Diplacanthus manus, hymenolepis nana, hymenolepis murina.
Hymenolepis diminuta infection infectious diseases msd. Nitazoxanide for the treatment of intestinal protozoan and helminthic infections in mexico. The complex life cycles of these cestodes consist of adult tapeworm stages in the small bowel of humans and rodents, and larval cysticercoid tissue stages in insects. It is small and measures up to 2540 mm in length by one mm in diameter.
Hymenolepiasis is caused by two cestodes tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length and hymenolepis dimnuta rat tapeworm, adults measuring 20 to 60 cm in length. Hymenolepis nana infection is observed in households with poor hygiene and overcrowding, and can have a prevalence of 525% in children 54. Human hymenolepiasis caused by one of two adult tapeworms hymenolepis diminuta or hymenolepis nana, is a globally widespread zoonotic infection known to be endemic in asia, southern and eastern europe, central and south america, and africa 3, 4, 5. Romero cabello r, guerrero lr, munoz garcia m, geyne cruz a.
Hymenolepiasis is an infection caused by hymenolepis nana h. Hymenolepis nana hymenolepis diminuta by daniela soto on. Human infection is usually asymptomatic, it but can cause mild gastrointestinal symptoms. Hymenolepis nana eggs are smaller than hymenolepis diminuta and have more crap hymenolepis nana eggs are smaller than hymenolepis diminuta and have more crap see more. Pdf differential diagnosis and molecular characterization of. The adult structure is 20 to 60 cm long and the mature proglottid is similar to that of h. Hymenolepis nana is the most common cause of all cestode infections, and is encountered worldwide. Due to obvious technical limitations, rodents are currently the mainstay for experimental mammalian cestode research. Hymenolepis diminuta and rodentolepis nana were found in r. The outer surface of the oncosphere is covered by an epithelial layer, termed the embryonic epithelium. Hymenolepis diminuta were significantly higher, which. It has slightly bigger eggs and proglottids than h.
Hymenolepis nana dwarf tapeworm infection infectious. This cestode belongs to a large family known as hymenolepididae. Praziquantel, adults and children, 25mgkg in a singledose therapy alternatives. Although the dwarf tapeworm infection rarely causes symptoms, it can be misdiagnosed for pinworm infection. 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. Laboratory diagnostic of hymenolepis nana dwarf tapeworm. Hymenolepis diminuta an overview sciencedirect topics. Nov 06, 2016 alarcon islas dulce raque armenta carrillo ana sofia astorga hernandez gabriela galindo parada arantza gpe inda lopez enery jhoseline.
Hymenolepis nana is the smallest of all tapeworms found in humans and is appropriately described as the dwarf tapeworm. Despite the use of hymenolepis diminuta as a model organism in experimental parasitology, a full genome description has not yet been published. Hymenolepiasis is prevalent throughout the world with human infections with h. The egg of the hymenolepis nana is characterized by a colorless shell with filaments emerging from polar thickenings and 3 pairs of hooklets within the hexacanth embryo. The dwarf tapeworm was found in man for the first time by bilharz, in cairo, egypt, in 1851. Hymenoleps nana e hymenoleps diminuta by nayara rufino on. Niclosamide as a treatment for hymenolepis diminuta and dipylidium caninum infection in man. Another key difference is found in the adult morphology. He recovered a countless number of them at a postmortem on a boy who had. Molecular characterization of hymenolepis nana based on. The parasite is among the neglected tropical diseases ntd.
Nov 24, 2018 the slightly round to oval egg of hymenolepis nana typically measures 45 by 38. Rodents are the main reservoir host of these cestodes. Hymenolepis diminuta definition of hymenolepis diminuta by. Hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. Hymenolepis nana definition of hymenolepis nana by medical. Humans, rodents most common tapeworm of humans in the world 1% rate of infection in the southern u. Hymenolepis diminuta, also known as rat tapeworm, is a species of hymenolepis tapeworm that causes hymenolepiasis. Hymenolepis diminuta is another member of the tapeworm family hymenolepididae soulsby, 1982.
Himenolepiasis parasitologia medica, 4e accessmedicina. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents. In temperate areas its incidence is higher in children and institutionalized groups. The species name nana is derived from its small size which means dwarf of the adult worm. The central hexacanth embryo is fitted with three standard pairs of hooklet. Hymenolepis nana, the dwarf tapeworm, is the smallest and a common tapeworm in humans worldwide. Heavy hymenolepis nana infection possibly through organic.
It is most often seen in children in countries in which sanitation and hygiene are inadequate. The fine structure of the envelopes surrounding hatched and unhatched oncospheres of hymenolepis nana has been investigated by transmission and scanning electron microscopy sem, together with light microscope histochemical observations of jb4 embedded material. Hymenolepis diminuta, while less frequent, has been reported from various areas of the world. Pdf differential diagnosis and molecular characterization. Hymenolepis diminuta and rodentolepis nana hymenolepididae. The patient was a 44yearold korean man who had suffered from chronic hepatitis type b for 15 years. Biologia simplificada com emerson inacio 4,735 views. To our knowledge, there are no studies that have analyzed the immune response in humans against h nana. Hymenolepis spp are wellestablished models in cestode research, specifically, the rat tapeworm h diminuta. Hymenolepiasis is the term when a human is infected with either h. Nov 22, 2015 hymenolepiasis is the term when a human is infected with either h.
Genetic variability among hymenolepis nana isolates from different. The slightly round to oval egg of hymenolepis nana typically measures 45 by 38. Values of prevalence, mean abundance and mean intensity were recorded, and new morphometric characters were described, adding to previously known information. It is inside the body cavity of these intermediate hosts that the ingested egg by way of contaminated. Hymenolepis infection or infection with the dwarf tapeworm is found worldwide. Human results showed distinct restriction patterns for both hymenolepiasis caused by the adult tapeworms, hymenolepis hymenolepis nana and hymenolepis diminuta when digested diminuta and hymenolepis nana, is a globally widespread with either of the enzymes rsai, haeiii or hhai.
When rat serum was added to the medium the larvae remained infective for 6 days at 30 c but not at. It is the only cestode that does not require an intermediate host to develop into its infective stage. Numerous polar filaments originate from the polar thickenings, which help to distinguish it from the egg of hymenolepis diminuta in. Hymenolepis nana vs hymenolepis dimunota medical laboratories. The fine structure of the oncosphere of hymenolepis nana has been investigated by transmission and scanning electron microscopy, together with light microscope observations of jb4 embedded material. Larval and adult beetles but optional larval stage, cysticercoid, can develop. Human hymenolepiasis is caused by hymenolepis nana i. Differential diagnosis and molecular characterization of hymenolepis nana and hymenolepis diminuta. Differential diagnosis and molecular characterization of. Especie hymenolepis nana hymenolepis diminuta tamano 2 4 cm 20 60 cm escolex 0. O maior importancia clinica e epidemiologica infeccao por h.
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