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10 Cards in this Set

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  • Back
What is Trichuris trichiura?
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.
What is the pathogenesis of Trichuria?
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.
How many eggs do females lay app?
3-5000 eggs.
The entire cycle is app. 90 days long.
What are symptoms of Trichuriasis?
Localized hemorrhage of the bowel.
Worse symptoms are dysentery, loss of muscle tone and rectal prolapse, which could be quite serious in children.
What is Enterobious vermicularis?
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.
What is Taenia soilium?
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.
In pigs, the eggs hatch in the small intestine and the released larvae migrate througout the organs. TRUE/FALSE
TRUE. Ultimately, they encyst in the muscles becoming cystercerci, young tapeworms that are the infective stage for humans.
What happens when humans ingest a cystercercus?
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.
Tapeworm larvae form bladder like sacs throughout the body that can cause serious damage. TRUE/FALSE
TRUE. The transmission and life cycle is cycle C.
Despite their size, tapeworms cause relatively few symptoms. TRUE/FALSE