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Exam 23: Parasitic Protozoa, Helminths, and Arthropod Vectors

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Question 41

Multiple Choice

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Balantidium coli uses ________ to penetrate the intestinal mucosa.

A) adhesion discs
B) flagella
C) cilia
D) pseudopodia
E) suckers

F) All of the above
G) A) and B)

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Question 42

Multiple Choice

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Trypanosoma cruzi is introduced into the body by

A) feces containing trypomastigotes contaminating a bite wound.
B) the bite of a tsetse fly, which introduces the trypomastigotes into the body.
C) ingesting food contaminated with the parasite.
D) the bite of a sand fly that has ingested phagocytes containing the parasite.
E) wearing contact lenses cleaned with contaminated tap water.

F) A) and D)
G) C) and E)

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Question 43

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After a trip to several South American countries,a middle-aged man becomes ill.He becomes anemic,loses weight,and runs a fever.The clinician notes a recently healed sore near his nose.Microscopic examination of a blood smear does not reveal anything other than the anemia.What parasitic infection is consistent with this scenario?

The most severe form of malaria,called "blackwater fever" is caused by Plasmodium (falciparum/malariae/ovale/vivax).

Which of the following helminth parasites do humans acquire by eating undercooked saltwater fish?

The only helminth disease of humans spread by an insect vector is

All tapeworms are intestinal parasites that completely lack digestive systems.

Parasitic diseases have been considered uncommon in developed countries but many are now emerging diseases in these parts of the world.Discuss factors that contribute to this shift.

Anemia is a common consequence of hookworm infestation.

Humans are the only reservoir for (Balantidium/Entamoeba/Giardia),an intestinal parasite that causes diarrhea.

A housefly can transmit diseases as a (biological/fomite/mechanical)vector.

Which of the following statements concerning infection with Toxoplasma is FALSE?

The most common nematode infection worldwide is (ascariasis/filariasis/pinworms).

Why is self-reinfection commonly seen in children that suffer from pinworms?

The ________ spreads more parasitic diseases to humans than any other vector.