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(Hymenolepis Nana)

Hymenolepis is generally found in the feces of rats which is consumed by its secondary hosts: beetles. The dwarf tapeworms mature into a life form referred to as a "cysticercoid" in the insect; in H. nana, the insect is always a beetle. Humans and other animals become infected when they intentionally or unintentionally eat material contaminated by insects. In an infected person, it is possible for the worm's entire life-cycle to be completed in the bowel, so infection can persist for years if left untreated. Hymenolepis nana infections are much more common than Hymenolepis diminuta infections in humans because, in addition to being spread by insects, they can be spread directly from person to person by eggs in feces. When this happens, H. nana oncosphere larvae encyst in the intestinal wall and develop into cysticercoids and then adults. Hymenolepis nana infections can grow worse over time because, unlike in most tapeworms, dwarf tapeworm eggs can hatch and develop without ever leaving the definitive host.

Dwarf tapeworm infections occur worldwide, but is most prevalent in the southern United States. Children are frequently infected, and infections in the same family are a common occurrence.

This is a short worm, only growing 1.5 inches long at maturity with about 200 segments (proglottids). The dwarf tapeworm does not need an intermediate host, but only one mammal to host its entire life cycle. The head is small with a single ring of small hooks and four cup-shaped suckers.

The dwarf tapeworm can infect humans when the eggs are ingested from contaminated food or water, or when infected food handlers pass this organism to others. The eggs also develop in grain beetles and many other insects, who then infect the grains that they eat. When humans eat these grains, they are also eating the organism. Rats, mice, hamsters, and dogs can also be infected by ingesting this organism and passing it along to humans. Most human infections result from human-to-human contact through the fecal-oral route. It is possible to be self-infected with this organism when the eggs pass out in the stool, depending upon a person's hygiene habits.

Mild infections are usually without symptoms, but if enough worms are present, symptoms can include diarrhea, itching, abdominal pain, headaches, and other vague digestive complaints. If the infection is severe, the symptoms may present as body weakness, weight and appetite loss, insomnia, abdominal pain with or without diarrhea, vomiting, dizziness, allergies, nervous disturbances, and anemia. The infection may still be without symptoms even when the person has a heavy infestation.

Identification of the eggs in the feces is definitive. The eggs have two membranes enclosing an embryo with six hooklets.

Life Cycle Diagram (Courtesy of the DPD)

Eggs of Hymenolepis nana are immediately infective when passed with the stool and cannot survive more than 10 days in the external environment . 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. A morphologically identical variant, H. nana var. fraterna, infects rodents and uses arthropods as intermediate hosts. When eggs are ingested (in contaminated food or water or from hands contaminated with feces), the oncospheres contained in the eggs are released. The oncospheres (hexacanth larvae) penetrate the intestinal villus and develop into cysticercoid larvae . Upon rupture of the villus, the cysticercoids return to the intestinal lumen, evaginate their scoleces , attach to the intestinal mucosa and develop into adults that reside in the ileal portion of the small intestine producing gravid proglottids . Eggs are passed in the stool when released from proglottids through its genital atrium or when proglottids disintegrate in the small intestine . An alternate mode of infection consists of internal autoinfection, where the eggs release their hexacanth embryo, which penetrates the villus continuing the infective cycle without passage through the external environment . The life span of adult worms is 4 to 6 weeks, but internal autoinfection allows the infection to persist for years.

Hymenolepis Nana, adult, stained mount.

The scolex has four
suckers and an
armed rostellum.
Hymenolepis Nana Eggs
The egg measures approximately
45 Ám in diameter.

Click the video below to view a tapeworm.

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Note: The statements contained on this website have not been reviewed or approved by the Food and Drug Administration for their validity. Nothing contained on this site is meant to infer or state that the products are for the treatment of any disease or ailment. Always consult with your physician if you experience any medical problems.

Source: Organism images courtesy of the DPD

References and additional information:
- Centers for Disease Control & Prevention
- Howard Hughes Medical Institute
- Ohio State University, Biological Sciences
- Skye Weintraub, ND "The Parasite Menace""; Woodland Publishing 2000
- Ann Louise Gittleman, MS, CNS "Guess What Came To Dinner?"; Avery 2001
- Valerie Saxion "Everybody Has Parasites"; Bronze Bow Publishing 2003
- Skye Weintraub "The Parasite Menace"; March 1998
- Roger M. Knutson "Fearsome Fauna: A Field Guide to the Creatures That Live in You"
- Carl Zimmer "Parasite Rex: Inside the Bizarre World of Nature's Most Dangerous Creatures"
- Paavo Airola, ND, PhD "How To Get Well"; Health Plus Publishers
- Nicholas Culpepper "Culpepper's Complete Herbal"; Omega 1985
- Penny C. Royal "Herbally Yours"; Sound Nutrition 1982
- James F. Balch, MD "Prescription For Nutritional Healing"; Sound Nutrition 1997
- Alma R. Hutchens "Indian Herbology of North America"; Merco 1973
- Discover Magazine; August 2000 Edition

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