Hymenolepis nana


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Hy·me·nol·e·pis na·'na

the dwarf or dwarf mouse tapeworm; a small tapeworm in humans, sometimes found in great numbers in the intestine; the cysticercoid can develop by two pathways: in the final host, with the egg from one human directly infective to another human host, in which both larval and adult stages occur, or through two hosts, an insect (or crustacean) intermediate and a vertebrate final host, the obligate two-host cycle of most cyclophylidean cestodes; in addition, Hymenolepis nana can internally reinfect the same human or rodent host, producing a massive reinfection.

Hy·me·nol·e·pis na·'na, var. fra·ter·'na

a race, strain, or subspecies of Hymenolepis nana adapted to mice, although infectivity to humans may remain; the human form, Hymenolepis nana, presumably is derived from the rodent strain.

Hymenolepis nana

A species parasitic in the intestine of rats and mice and common in humans, esp. children. It averages about 1 in (2.51 cm) in length and differs from other tapeworms in that it is capable of completing its life cycle within a single host. The parasite in humans lives in the proximal ileum and can cause severe toxic symptoms, esp. in children, including diarrhea, abdominal pain, irritability, and convulsions that resemble epilepsy. The detection of eggs and gravid segments in the feces confirms the diagnosis of infestation with this parasite. Treatment is with praziquantel. Synonym: dwarf tapeworm; mouse tapeworm; rat tapeworm
See also: Hymenolepis

Hymenolepis

a genus of cyclophyllidean tapeworms of the family Hymenolepididae; mostly have little pathogenicity.

Hymenolepis cantaniana
found in small intestine of chickens and other birds.
Hymenolepis carioca
occurs in fowls.
Hymenolepis diminuta
occurs in wild rodents and in humans.
Hymenolepis lanceolata
found in ducks and geese.
Hymenolepis microstoma
found in duodenum, gallbladder and bile ducts of rodents.
Hymenolepis nana
occurs in primates, rodents and humans. Called also dwarf tapeworm.
References in periodicals archive ?
As shown in Table IV, Ascaris lumbricoides, Trichuris trichiura, Hymenolepis nana and Giardia lamblia have a significant difference between males and females; while there is no significance detected in Entamoeba histolytica.
La investigacion coproparasitologica en la comunidad indigena Maxakali, establecida en el Estado de Minas Gerais, Brasil (13), sobre la incidencia de parasitosis intestinales, con 409 muestras analizadas, encontro 90,3% positivas, siendo las especies prevalentes: Entamoeba histolytica (48,9%), Ancilostomideos (37,9%), Giardia lamblia (32%), Schistosoma mansoni (23,7%), Hymenolepis nana (18,6%), Strongyloides stercoralis (5,4%), Ascaris lumbricoides (4,9%) y Trichuris trichiura (0,5%).
55 Constant Hymenolepis nana 35 Accessory Taenia sp 26 Accessory Enterobius vermicularis 11 Rare Constant occurs in more than 50% of the samples.
Por otra parte, la concordancia en nuestro estudio fue perfecta para Cyclospora cayetanensis,Trichomonas hominis, Iodamoeba butschlii e Hymenolepis nana, y excelente para Ascaris lumbricoides y Chilomatix mesnili, esto difiere de lo reportado en el estudio de Duque y colaboradores, en el que la concordancia fue casi perfecta para Giardia lamblia, notable para Trichomonas hominis, moderada para Iodamoeba butschlii y Entamoeba coli, regular para Endolimax nana, Trichuris trichiuray Blastocystis hominis, mala para Entamoeba histoytica y nula para Entamoeba hartmanni (24).
multilocularis Larva Alveolar cyst Multilocular cysts disease Diphyllobothrium Adult Fish tapeworm Pernicious anemia latum Hymenolepis nana Adult Dwarf tapeworm Rarely symptomati Spirometra Larva Sparganosis Subcutaneous larva mansonoides Table 2.
29] analizaron 1643 muestras de heces y 732 tractos intestinales de porcinos de varias regiones de Venezuela, refiriendo como un "hallazgo ocasional" la presencia de huevos de Hymenolepis nana en seis muestras fecales, lo que atribuyeron a la contaminacion de los corrales con heces de roedores [29].
Cabe mencionar que algunos de estos animales presentaron poli parasitismo como fue el caso del pavo real (Pavo cristatus) que presento estrongilidos y ancylostomidos, de igual forma los primates churucos (Lagothrix lagotricha), y el titi gris (Saguinus leucopus) con ancylostomidos y acantocephalos o ancylostomidos e Hymenolepis nana.
Nine parasites were recorded, in descending frequency: Entamoeba histolytica/dispar, Giardia lamblia, Ascaris lumbricoides, Hookworms, Trichuris trichura, Hymenolepis nana, Schistosoma mansoni, Blastocystis hominis, Enterobius vermicularis.
Etiologia: Hymenolepis nana , Hymenolepis diminuta la incidencia no es elevada.
Por otra parte, tambien existen estudios que asocian la infeccion por especies especificas de parasitos con condiciones higienico sanitarias muy bajas como el caso de la infeccion por Hymenolepis nana asi como ocurre en este estudio (14).
Entre los helmintos identificados, el cestode Hymenolepis nana es reconocido como uno de los parasitos de humanos mas comunes.