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68 Cards in this Set

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This small nematode lays sticky eggs at night. Eggs are flattened on one side.
Enterobius vermicularis
Gravid female worms migrate to the perianal region of the patient at night and lay eggs.
Enterobius vermicularis
This adult nematode is characterized as having alae (wings) at the side of the head.
Enterobius vermicularis
This very large nematode is acquired by direct hand-to-mouth infection (patient eats it).
Ascaris lumbricoides
The correct method of diagnosis of this nematode is the scotch tape preparation.
Enterobius vermicularis
True or False? Ascaris lumbricoides eggs are swallowed the eggs hatch and the worms mature and live by eating intestinal contents.
FALSE. Ascaris lumbricoides eggs hatch, the larvae penetrate the intestinal lining, migrate through the lungs while maturing, ascend the bronchial tree and are swallowed. The adults now live in the lumen of the intestine.
This nematode “sews” its anterior end into the intestinal wall.
Trichuris trichiura
This nematode attaches itself to the intestinal villi by biting with semi-lunar cutting plates.
Necator americanus (hookworm)
This nematode attaches itself to the intestinal villi by biting with fang-like teeth.
Ancylostoma duodenale (hookworm)
This nematode has a complicated life cycle that features a free living option and an autoinfective option in addition to its parasitic life cycle.
Strongyloides stercoralis
This nematode infection is often diagnosed by detecting rhabditiform larvae in the stool.
Strongyloides stercoralis
This female nematode is parthenogenic and burrows into the intestinal wall to lay eggs.
Strongyloides stercoralis
This larval nematode is the cause of visceral larval migrans. Name the genus and species.
Toxocara canis or Toxocara cati
This larval form of this nematode is the cause of cutaneous larval migrans or creeping nematodes. Name the genus and species.
Ancylostoma caninum (dog hookworm), or any non-human hookworm. The larvae are "lost" and wander under the skin.
This nematode infection is acquired by eating the raw or poorly cooked flesh of mammals. The larvae encyst in the muscle tissue of the human host. Name possible mammalian sources of this infection and name the genus and species of the parasite.
Trichinella spiralis, and it can be acquired by eating poorly cooked pork or bear, maybe others.
This filarial nematode is acquired by being bitten by mosquitoes.
Wucheria bancrofti and Brugia malayi
This filarial nematode is acquired by being bitten by a fly. Adults migrate across the eyeball.
Loa loa
Name the causative agent of elephantiasis.
Wucheria bancrofti and Brugia malayi
Name the genus and species of the filarial nematode that causes “River Blindness”.
Onchocerca volvulus
Scotch tape "touch preps" are used to diagnose infections with this parasite.
Enterobius vermicularis
Eggs of this nematode are characteristically flattened on one side.
Enterobius vermicularis
Females of this species of nematode migrate to the perianal reion, the uterus prolapses expelling all her eggs. The adult usually dies.
Enterobius vermicularis
This nematode infection can be spread to others in elementary school or day care centers.
Enterobius vermicularis
Enterobius vermicularis was named by Linnaeus in 1758. Apparently it has been a recognized problem for a very long time.
Just thought you would want to know.
This nematode burrows into the intestinal lining. It can lay fertilized eggs which hatch and rhabditiform larvae are found in the stool.
Strongyloides stercoralis
This nematode can have a free-living life cycle where adults live in the soil.
Strongyloides stercoralis
This nematode has a complex life cycle that features free living adults in soil, direct penetration of human skin and parthenogenic females.
Strongyloides stercoralis
What is the infective stage of Ascaris lumbricoides?
Egg
Which nematode can cause physical obstruction of the intestine?
Ascaris lumbricoides
Which nematodes migrate through the lungs?
Ascaris lumbricoides, hookworm, Strongyloides.
What is the infective stage of Enterobius vermicularis?
Egg
What is the genus and species of the causative agent for pinworm?
Enterobius vermicularis
What is the specimen of choice for pinworm detection?
Scotch-tape prep. Clear tape only. Not frosted.
Which nematode infection is characterized by intense itching in perianal area?
Enterobius vermicularis
What is the infective stage of Ancylostoma duodenale?
Filariform larvae.
What is the infective stage of Necator americanus?
Filariform larvae
What species of mammal(s) are associated with cutaneous larval migrans (common name)?
Dog & cat
What is the causative agent of cutaneous larval migrans?
Filariform larvae of non-human hookworms.
Which nematode actively sucks blood from intestinal villi?
Hookworm (Necator americanus, Ancylostoma duodenale)
Anemia would be expected in which nematode infection?
Hookworm
What is the infective stage of Trichuris trichiura?
Egg
What is the genus and species of whipworm?
Trichuris trichiura
Which nematode "sews" itself into the intestinal wall?
Trichuris trichiura
Which nematode can cause prolapse of the rectum?
Trichuris trichiura
Name the host of the nematode that encysts in muscle tissue.
Pig (also bear). Trichinella spiralis
What is the causative agent of River Blindness?
Onchocerca volvulus
Name the genus and species of the nematode that can crawl across the eyeball.
Loa loa.
Name the genus and species of the nematode that can be acquired by eating poorly cooked pork.
Trichinella spiralis
Name the agent(s) of visceral larval migrans.
Toxocara canis, and T. cati
What is the definitive host of the nematode that causes cutaneous larval migrans?
Most often - domestic dog.
Name the only host of Enterobius vermicularis
Humans
There is a second species of Enterobius Vermicularis in other countries of Europe, Africa and Asia. Name it
Enterobius gregorii
Where is the microscopic ID of the eggs collected for Enterobius Vermicularis?
the perianal area
What is the test called for ID of Enterobius Vermicularis?
The scott tape test
Is there an alternate test for Enterobius Vermicularis
Yes, the anal swab or swab tubes
What is considered the diagnostic evidence of Enterobius Vermicularis?
Adult worms found in the stool
Following ingestion of contaminated eggs where do the eggs hatch, Enterobius Vermicularis
The small intestine
Where do the eggs migrate to when they become adults: Enterobius Vermicularis
The large intestine
The time of ingestion of infected to to oviposition by the adult female is what in Enterobius Vermicularis
About 1 month
What is the life span of Enterobius Vermicularis
about 2 months
The most common helminthic infection in the United states
Enterobius Vermicularis
Albendoazole or mebendazole
Drugs of choice for treatment of Enterobius Vermicularis
Pyrantel pamoate
alternate drug for treatment of Enterobius Vermicularis
How many specimen collections are recommended for Enterobius Vermicularis diagnosis
6 consecutive days
How is collection done with Enterobius Vermicularis
In the morning prior to bathing and bowel movements
Another name for scott tape test
cellulose tape method
What color does pyrantel pamoate stain stool
bright red