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10 Cards in this Set
- Front
- Back
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What is Trichuris trichiura?
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This nematode also called a whipworm, and humans are the sole host.
Eggs deposited in the soil are not immediately infective and continue development for 3-6 weeks in this habitat. |
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What is the pathogenesis of Trichuria?
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1. Ingested eggs hatch in the small intestine where the larvae attach, penetrate the outer wall and go through several molts.
2. Mature adults move to the large intestine and gain a hold with their long thin heads while the thicker tail dangles free in the intestinal lumen. |
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How many eggs do females lay app?
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3-5000 eggs.
The entire cycle is app. 90 days long. |
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What are symptoms of Trichuriasis?
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Localized hemorrhage of the bowel.
Worse symptoms are dysentery, loss of muscle tone and rectal prolapse, which could be quite serious in children. |
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What is Enterobious vermicularis?
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It is the pinworm. It is a nematode, and the transmission is of the cycle A type.
Worms are ingested from food, drink or fingers. Eggs hatch in the small intestine and release larvae in the large intestine. Anal itching is a common sign. |
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What is Taenia soilium?
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This is a tapeworm. adults are about 5m long and have a scolex with hooklets and suckers to attach to the intestine.
This is a classic pig tapeworm. |
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In pigs, the eggs hatch in the small intestine and the released larvae migrate througout the organs. TRUE/FALSE
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TRUE. Ultimately, they encyst in the muscles becoming cystercerci, young tapeworms that are the infective stage for humans.
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What happens when humans ingest a cystercercus?
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When this is ingested, usually in a pork product, the coat is digested and the organism is flushed into the intestine where it attaches by the scolex and develops into an adult tapeworm.
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Tapeworm larvae form bladder like sacs throughout the body that can cause serious damage. TRUE/FALSE
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TRUE. The transmission and life cycle is cycle C.
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Despite their size, tapeworms cause relatively few symptoms. TRUE/FALSE
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TRUE.
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