IPAP Microbio Exam 5 Nematodes 1
Terms in this set (50)
This small nematode lays sticky eggs at night. Eggs are flattened on one side.
Gravid female worms migrate to the perianal region of the patient at night and lay eggs.
This adult nematode is characterized as having alae (wings) at the side of the head.
This very large nematode is acquired by direct hand-to-mouth infection (patient eats it).
The correct method of diagnosis of this nematode is the scotch tape preparation.
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.
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.
This nematode infection is often diagnosed by detecting rhabditiform larvae in the stool.
This female nematode is parthenogenic and burrows into the intestinal wall to lay eggs.
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.
Name the causative agent of elephantiasis.
Wucheria bancrofti and Brugia malayi
Name the genus and species of the filarial nematode that causes "River Blindness".
Scotch tape "touch preps" are used to diagnose infections with this parasite.
Eggs of this nematode are characteristically flattened on one side.
Females of this species of nematode migrate to the perianal reion, the uterus prolapses expelling all her eggs. The adult usually dies.
This nematode infection can be spread to others in elementary school or day care centers.
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.
This nematode can have a free-living life cycle where adults live in the soil.
This nematode has a complex life cycle that features free living adults in soil, direct penetration of human skin and parthenogenic females.
What is the infective stage of Ascaris lumbricoides?
Which nematode can cause physical obstruction of the intestine?
Which nematodes migrate through the lungs?
Ascaris lumbricoides, hookworm, Strongyloides.
What is the infective stage of Enterobius vermicularis?
What is the genus and species of the causative agent for pinworm?
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?
What is the infective stage of Ancylostoma duodenale?
What is the infective stage of Necator americanus?
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?
What is the infective stage of Trichuris trichiura?
What is the genus and species of whipworm?
Which nematode "sews" itself into the intestinal wall?
Which nematode can cause prolapse of the rectum?
Name the host of the nematode that encysts in muscle tissue.
Pig (also bear). Trichinella spiralis
What is the causative agent of River Blindness?
Name the genus and species of the nematode that can crawl across the eyeball.
Name the genus and species of the nematode that can be acquired by eating poorly cooked pork.
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.