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Pathogenic Parasites

A traveler developed diarrhea 2 weeks after returning from a trip to Moscow and St. Petersburg, Russia. The diarrhea has lasted for over 3 weeks and his stools are greasy and foul-smelling. Which of the following is the most probable etiologic agent?

A. Toxoplasma

B. Giardia

C. Trichinella

D. Entamoeba

E. Toxocara

A 45-year-old African man suffers from chronic fatigue and weakness. At a routine examination at his village clinic he was found to be profoundly anemic. Which of the following agents is most likely to be responsible?

A. Diphyllobothrium latum

B. Strongyloides stercoralis

C. Ascaris lumbricoides

D. Enterobius vermicularis

E. Ancylostoma duodenale

An Indonesian man has vague complains of epigastric pain and abdominal tenderness. An evaluation for a peptic ulcer was negative. A diagnosis of strongyloidiasis has been suggested. The best way to confirm this diagnosis is:

A. Finding eggs in the feces

B. Finding adult worms in the feces

C. Finding larval worms in the feces

D. X-ray evidence of pneumonia

A man who moved to the United States from Ethiopia 10 years ago has been well but over the past year has lost significant weight. He reports a healthy appetite and no change in his food consumption. If he has a tapeworm, it was acquired by ingesting tissue containing:

A. Cysticerci

B. Cercariae

C. Copepods (crustaceans)

D. Hydatid cysts

E. Microfilariae

A child presents with a prolapsed rectum, a history of diarrhea and a fondness for eating dirt. She is anemic and looks malnourished. A stool examination reveals barrel-shaped eggs with “plugs” at either end. She is most likely infected with:

A. Ascaris lumbricoides

B. Enterobius vermicularis

C. Trichuris trichiura

D. Necator americanus

E. Strongyloides stercoralis

At a ...

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