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Alternative namesTeniasis; Pork tapeworm; Beef tapeworm; Tapeworm; Taenia saginata; Taenia solium
DefinitionTaeniasis is a tapeworm infection.
Causes, incidence, and risk factors
Tapeworm infection is acquired by eating raw or undercooked meat of infected animals. Beef generally carry Taenia saginata while pigs carry Taenia solium . The larvae from the infected meat develop in the human intestine into the adult tapeworm -- which grows and can attain lengths greater than 12 feet.
Tapeworms are segmented, with each segment (proglottid) capable of producing eggs. Eggs are dispersed by individual or groups of proglottids detaching and passing out with the stool. The groups of proglottids from the beef tapeworm are capable of movement and actively crawl out through the anus.
Additionally, these individuals can expose other individuals to
eggs, usually via food handling. Ingested eggs hatch in the intestinal track and the larvae migrate through the tissues, where they encyst. If larvae migrate to the brain, they can cause seizures and other neurological problems. This condition is called cysticercosis .
SymptomsTapeworm infestation does not usually cause any symptoms. Infection is generally recognized when the infected person passes segments of proglottids in the stool, especially if the segment is moving.
Signs and tests
TreatmentTapeworms are treated with oral medications, usually in a single dose. The drug of choice for tapeworm infections is niclosamide. Praziquantel and albendazole can also be used.
Expectations (prognosis)Complete eradication of the tapeworm occurs following treatment.
Calling your health care providerCall for an appointment with your health care provider if you pass something in your stool that looks like a white worm.
PreventionIn the U.S., laws governing feeding practices and inspection of domestic food animals have largely eliminated the problem of tapeworm. Adequate cooking of meat destroys the tapeworm larvae and will prevent infection by tapeworm. Good hygiene and hand washing after using the toilet will prevent self-infection in a person already infected with tapeworms.
Update Date: 11/18/2003D. Scott Smith, MD, MSc, DTM&H, Infectious Diseases Division and Dept. of Microbiology and Immunology, Stanford University Medical School, Stanford, CA. Review provided by VeriMed Healthcare Network.
Last updated: Tue, 06 Jan 2009 00:20:03 GMT