Hymenolepiasis is infestation by one of two species of tapeworm: Hymenolepis nana or Hymenolepis diminuta.
Alternative NamesDwarf tapeworm infection; Rat tapeworm; Tapeworm - infection
Causes, incidence, and risk factorsHymenolepis live in warm climates and are common in the southern United States. The eggs of these worms are ingested by insects.
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.
Hymenolepis nana infections are much more common than Hymenolepis diminuta infections in humans. These infections were previously common in the southeastern United States, and have been described in crowded environments and individuals confined to institutions. However, the disease occurs throughout the world.
SymptomsSymptoms occur only with heavy infections. Symptoms include:
Examination of the stool for eggs confirms the diagnosis.
TreatmentPraziquantel as a single dose is the current treatment of choice for this condition.
Expectations (prognosis)Expect full recovery following treatment.
ComplicationsCall your health care provider if chronic diarrhea or abdominal cramping are present.
PreventionGood hygiene, public health and sanitation programs, and elimination of rats help prevent the spread of hymenolepiasis.
ReferencesBlanton R. Adult tapeworm infections. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 18th Ed. Philadelphia, Pa: Saunders Elsevier; 2007: chap 299.
Richard FO Jr. Diphyllobothrium, dipylidium, and hymenolepsis species. In: Long SS, Pickering LK, Prober CG. Principles and Practice of Pediatric Infectious Diseases. 3rd ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008: chap: 279.
Hymenolepiasis is infestation by one of two species of tapeworm: Hymenolepis nana or Hymenolepis diminuta.
Alternative NamesDwarf tapeworm infection; Rat tapeworm; Tapeworm - infection
Causes, incidence, and risk factorsHymenolepis live in warm climates and are common in the southern United States. Insects eat the eggs of these worms.
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 last for years.
Hymenolepis nana infections are much more common than Hymenolepis diminuta infections in humans. These infections used to be common in the southeastern United States, in crowded environments and in people who were confined to institutions. However, the disease occurs throughout the world.
SymptomsSymptoms occur only with heavy infections. Symptoms include:
Examination of the stool for eggs confirms the diagnosis.
TreatmentThe treatment for this condition is a single dose of praziquantel, repeated in 10 days.
Expectations (prognosis)Expect full recovery following treatment.
ComplicationsCall your health care provider if chronic diarrhea or abdominal cramping are present.
PreventionGood hygiene, public health and sanitation programs, and elimination of rats help prevent the spread of hymenolepiasis.
ReferencesBlanton R. Adult tapeworm infections. In: Kliegman RM, Behrman RE, Jenson HB, Stanton BF, eds. Nelson Textbook of Pediatrics. 19th Ed. Philadelphia, Pa: Saunders Elsevier; 2011: chap 294.
Richardz FO Jr. Diphyllobothrium, Dipylidium, and Hymenolepsis species. In: Long SS, ed. Principles and Practice of Pediatric Infectious Diseases. 3rd ed. Philadelphia, Pa: Churchill Livingstone Elsevier; 2008: chap: 279.
Reviewed ByReview Date: 08/24/2011
Linda Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington School of Medicine; Jatin M. Vyas, MD, PhD, Assistant Professor in Medicine, Harvard Medical School, Assistant in Medicine, Division of Infectious Disease, Department of Medicine, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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