It is small and measures up to 2540 mm in length by one mm in diameter. Eggs of hymenolepis nana are immediately infective when passed with the stool and cannot survive more than 10 days in the external environment. In this study we examined the intestinal mucosa of an adult asymptomatic patient harboring adult and larval dwarf tapeworms hymenolepis nana. This cestode belongs to a large family known as hymenolepididae. Humans, rodents most common tapeworm of humans in the world 1% rate of infection in the southern u. Hymenolepis definition of hymenolepis by medical dictionary. Hymenolepis nana definition of hymenolepis nana by. When eggs are ingested by an arthropod intermediate host various.
If larvabearing eggs enter the human gastrointestinal tract, the oncospheres are released into the duodenum and attatch to. In this article we will discuss about hymenolepis nana. Larval and adult beetles but optional larval stage, cysticercoid, can develop in d. Hymenolepiasis is caused by two cestodes tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in. In human adults, the tapeworm is more of a nuisance than a health problem, but in small children, many h. In 1906, stiles identified an identical parasite with a rodent host and named it hymenolepis fraterna. Hymenolepis diminuta is a cestode of rodents infrequently seen in humans and frequently found in rodents. Hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans. The infection is more frequently seen in children although adults are also infected. Hymenolepis nana introduction hymenolepis nana, the dwarf tapeworm, is the smallest tapeworm to infect humans.
Hymenolepiasis is primarily caused by the cestode tapeworm species, hymenolepis nana the dwarf tapeworm, adults measuring 15 to 40 mm in length. Another key difference is found in the adult morphology. Hymenolepiasis is the most common intestinal tapeworm infection of humans caused by worm of family cestoda, genus hymenolepis and species nana. Hymenolepis nana is the most common cestode parasite of humans in the world roberts and janovy, 2000. Later, morphological characteristics were used for taxonomy identification and 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. Teresa cabezas, fernando cobo, joaquin salas y jose vazquez hymenolepis nana infection. Infestazione da hymenolepis nana verme a nastro nano eziologia, patofisiologia, sintomi, segni, diagnosi e prognosi disponibili su manuali msd versione per i professionisti. It has a cosmopolitan distribution and is thought to be the most common tapeworm throughout the world. This infection does not require an intermediate host and infection can occur directly from one.1186 1142 563 436 534 909 443 309 1378 572 166 39 1207 248 1201 466 80 377 1287 515 66 535 640 322 1132 616 687 777 621 757 632 326 1173 1357 78 366 978 377 960 416 474 974 221