Hymenolepis nana vs hymenolepis dimunota medical laboratories. Hymenolepis nana is the smallest of all tapeworms found in humans and is appropriately described as the dwarf tapeworm. Headache, dizziness, sleep and behavior disturbances are frequent. Hymenolepis diminuta, while less frequent, has been reported from various areas of the world. In temperate areas its incidence is higher in children and institutionalized groups. O maior importancia clinica e epidemiologica infeccao por h. It is inside the body cavity of these intermediate hosts that the ingested egg by way of contaminated. Especie hymenolepis nana hymenolepis diminuta tamano 2 4 cm 20 60 cm escolex 0.
In the southeastern usa, as many as 1% of young schoolchildren are infected. Differential diagnosis and molecular characterization of hymenolepis nana and hymenolepis diminuta. The adult structure is 20 to 60 cm long and the mature proglottid is similar to that of h. Niclosamide as a treatment for hymenolepis diminuta and dipylidium caninum infection in man. Hymenolepis diminuta definition of hymenolepis diminuta by. Pdf differential diagnosis and molecular characterization. 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. 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. It is the only cestode that does not require an intermediate host to develop into its infective stage. Praziquantel, adults and children, 25mgkg in a singledose therapy alternatives. Nov 06, 2016 alarcon islas dulce raque armenta carrillo ana sofia astorga hernandez gabriela galindo parada arantza gpe inda lopez enery jhoseline. Pdf the aim of this survey was to study two hymenolepididae species in urban rodents, rattus rattus and rattus norvegicus, and to analyse.
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. Hymenolepis nana dwarf tapeworm infection infectious. Differential diagnosis and molecular characterization of. We encountered a patient with heavy hymenolepis nana infection. Hymenolepis nana is the most common cause of all cestode infections, and is encountered worldwide. It has slightly bigger eggs and proglottids than h. Hymenolepis diminuta and rodentolepis nana were found in r. It is the smallest and only cestode that parasites the human without any intermediate host.
Cdc hymenolepis resources for health professionals. Hymenolepiasis is the term when a human is infected with either h. The patient was a 44yearold korean man who had suffered from chronic hepatitis type b for 15 years. Larval and adult beetles but optional larval stage, cysticercoid, can develop. Nov 24, 2018 the slightly round to oval egg of hymenolepis nana typically measures 45 by 38. Hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. Hymenolepis nana hymenolepis diminuta by daniela soto on.
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. Some common intermediate hosts include flour moths, flour beetles, meal worms, and cockroaches. Despite the use of hymenolepis diminuta as a model organism in experimental parasitology, a full genome description has not yet been published. Hymenolepis diminuta and rodentolepis nana hymenolepididae. Another key difference is found in the adult morphology. The oncosphere is surrounded by 3 layers the capsule, the outer envelope and the. 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. Hymenolepis diminuta has a cosmopolitan distribution with prevalence up to 1% in parts of india. Hymenoleps nana e hymenoleps diminuta by nayara rufino on prezi. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents life cycles. 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. Hymenolepis diminuta an overview sciencedirect topics.
Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents. Hymenolepis diminuta is a tapeworm that can cause intestinal infection in humans. This cestode belongs to a large family known as hymenolepididae. The central hexacanth embryo is fitted with three standard pairs of hooklet. Numerous polar filaments originate from the polar thickenings, which help to distinguish it from the egg of hymenolepis diminuta in. 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. Hymenoleps nana e hymenoleps diminuta by nayara rufino on. Morfologia ciclo biologico introducao hymenoleps diminuta hymenolepis nana hymenoleps nana e hymenoleps diminuta ciclo biologico ciclo biologico morfologia. To our knowledge, there are no studies that have analyzed the immune response in humans against h nana. In this article we will discuss about hymenolepis nana. Hymenolepiasis is prevalent throughout the world with human infections with h.
Genetic variability among hymenolepis nana isolates from different. 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. Hymenolepis nana, the dwarf tapeworm, is the smallest and a common tapeworm in humans worldwide. The slightly round to oval egg of hymenolepis nana typically measures 45 by 38. The parasite is among the neglected tropical diseases ntd.
When rat serum was added to the medium the larvae remained infective for 6 days at 30 c but not at. Molecular characterization of hymenolepis nana based on. Hymenolepis nana infection is observed in households with poor hygiene and overcrowding, and can have a prevalence of 525% in children 54. The dwarf tapeworm was found in man for the first time by bilharz, in cairo, egypt, in 1851. Hymenolepiasis is an infection caused by hymenolepis nana h. He recovered a countless number of them at a postmortem on a boy who had died of meningitis. Hymenolepis spp are wellestablished models in cestode research, specifically, the rat tapeworm h diminuta. Himenolepiase causas, sintomas, diagnostico e tratamento. Himenolepiasis parasitologia medica, 4e accessmedicina. The difference between the eggs is used for diagnostic purposes. Pdf hymenolepis nana and hymenolepis diminuta are globally widespread zoonotic cestodes. Hymenolepis diminuta, also known as rat tapeworm, is a species of hymenolepis tapeworm that causes hymenolepiasis. Although the dwarf tapeworm infection rarely causes symptoms, it can be misdiagnosed for pinworm infection. He recovered a countless number of them at a postmortem on a boy who had.
Rodents are the main reservoir host of these cestodes. Human hymenolepiasis is caused by hymenolepis nana i. Nitazoxanide for the treatment of intestinal protozoan and helminthic infections in mexico. Pdf differential diagnosis and molecular characterization of. 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. The species name nana is derived from its small size which means dwarf of the adult worm. Laboratory diagnostic of hymenolepis nana dwarf tapeworm. It is small and measures up to 2540 mm in length by one mm in diameter. Nov 22, 2015 hymenolepiasis is the term when a human is infected with either h. Human infection is usually asymptomatic, it but can cause mild gastrointestinal symptoms. Hymenolepis diminuta were significantly higher, which.
Hymenolepis infection or infection with the dwarf tapeworm is found worldwide. Larval and adult beetles but optional larval stage, cysticercoid, can develop in d. The parasite is commonly known as the rat tapeworm. Values of prevalence, mean abundance and mean intensity were recorded, and new morphometric characters were described, adding to previously known information. Biologia simplificada com emerson inacio 4,735 views.
Humans, rodents most common tapeworm of humans in the world 1% rate of infection in the southern u. The outer surface of the oncosphere is covered by an epithelial layer, termed the embryonic epithelium. A shell full of polar thicknesses protects the embryo. It is most often seen in children in countries in which sanitation and hygiene are inadequate. Hymenolepis diminuta infection infectious diseases msd. 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. Diplacanthus manus, hymenolepis nana, hymenolepis murina. Romero cabello r, guerrero lr, munoz garcia m, geyne cruz a. Due to obvious technical limitations, rodents are currently the mainstay for experimental mammalian cestode research. Hymenolepiasis is more frequent among children, and most human infections remain asymptomatic and selflimited. Hymenolepis nana is also known as the dwarf tapeworm. Heavy hymenolepis nana infection possibly through organic. Hymenolepis diminuta is another member of the tapeworm family hymenolepididae soulsby, 1982.
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