1- Which of the following infections are not diagnosed by finding eggs or lava i

Question

1- Which of the following infections are not diagnosed by finding eggs or lava in fecal specimens? Man is an accidental or dead end host:

A. Ascaris lumbricoides B. Necator spp. C. Trichinella spiralis D. Trichuris trichiura.

2.) The nematode infection(s) that may become more severe through ingestion of infective eggs (especially in infected infants). Symptoms include pruritis ani. The specimen of choice for diagnosis is a cellophane tape prep obtained early in the morning. The infection is caused by:

A. Ascaris lumbricoides B. Enterobius vermicularis C. Trichuris triciura D. All of the above

3.) A soldier returning from Iraq noticed a blister above his ankle that subsequently opened while he was swimming in his family pool. On further examination, he noticed a worm in the open blister. This nematode infection is acquired by ingesting a Cyclops (water flea). The parasite is probably:

A. Ancylostoma duodenali B. Dracunculus medinensis C. Toxocara canis D. Visceral larval migrans .

Explanation / Answer

1. C. Trichinella spiralis. Stool samples do not show the presence of egg or larvae. This is because their larvae do not remain in the intestine, rather they are buried inside the muscle tissues.

2. B. Enterobius vermicularis.

3. B. Dracunculus medinensis.

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