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Parasite > Parasitiology Success > Flashcards

Parasitiology Success Flashcards

1
Q

Cysts are the infective stage of this intestinal flagellate.
A. Balantidium coli
B. Dientamoebafragilis
C. Entamoeba coli
D. Giardia lamblia

A

D

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2
Q

Eggs or larvae recovered in the stool are not routinely used to diagnose infections caused by which one of the following helminths?
A. Trichinella spiralis
B. Strongyloides stercomlis
C. Necator americanus
D. Ascaris lumbricoides

A

A

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3
Q

Which of the following is typical in cysts of lodamoeba biitschlii?
A. A glycogen mass
B. Blunt chromatoidal bars
C. Four nuclei with large karyosomes
D. Many ingested bacteria

A

A

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4
Q

ich species of malaria parasite usually
has ameboid trophozoites and produces small reddish dots in the red blood cell cytoplasm?
A. Plasmodium knowlesi
B. Plasmodium falciparum
C. Plasmodium malariae
D. Plasmodium vivax

A

D

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5
Q

With a fecal specimen, which one of the following is the most dependable procedure for the accurate, specific diagnosis of an intestinal amebic infection?
A. Direct saline wet mount
B. Direct iodine wet mount
C. Permanently stained smear
D. Formalin-ethyl acetate sedimentation

A

C

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6
Q

In an examination of stained blood films, Babesia spp. are likely to resemble
A. Leishmania donovani
B. Plasmodiumfalciparum
C. Toxoplasma gondii
D. Trypanosoma cruzi

A

B

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7
Q

Examination of a fecal smear following acid-fast stain reveals round acid-fast positive structures 8-10 um in diameter. You should suspect
A. Cryptosporidium
B. Cyclospom
C. Isospora
D. Microsporidia

A

B

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8
Q

A patient with history of human immuno- deficiency virus infection presents with a 5-day history of diarrhea and weight loss. A series of stool specimens is collected and examined for the presence of ova and parasites. An acid-fast stain on direct smear reveals pink-stained round structures approximately 4 (amin diameter. The most likely pathogen is
A. Blastocystis hominis
B. Cryptosporidium sp.
C. Isospora sp.
D. Microsporidiu

A

B

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9
Q

A modified trichrome stain of a fecal smear can be used to detect microsporidia. Which of the following would describe the appearance of this parasite in this stain?
A. Purple circles, 10-15 um in diameter
B. Pink ovals, 1-3 urn in diameter
C. Blue ovals, 4-6 urn in diameter
D. Fluorescent circles, 8-12 um in
diameter

A

B

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10
Q

Hydatid cysts in humans are due to ingestion of a tapeworm stage normally found in canines. This stage is the
A. Cercaria
B. Cercocystis
C. Cysticercus
D. Embryonatedegg

A

D

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11
Q

For which of the following diseases is close contact with an infected human host the most important mechanism of transmission?
A. Schistosomiasis
B. Toxoplasmosis
C. Trichinosis
D. Trichomoniasis

A

D

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12
Q

Migration of larva through the skin can sometimes produce allergic reactions called larva migrans; this is associated with
A. Strongyloides stercoralis
B. Dracunculus medinensis
C. Onchocerca volvulus
D. Loa loa

A

A

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13
Q

A free-living ameba that causes primary amebic meningoencephalitis is
A. Dientamoebafragilis
B. Entamoeba coli
C. Entamoeba histolytica
D. Naegleriafowleri

A

D

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14
Q

Which stage of Taenia saginata is usually infective for humans?
A. Cysticercus larva
B. Embryonatedegg
C. Filariform larva
D. Rhabditiformlarva

A

A

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15
Q

Which stage of Trichuris trichiura is infective for humans?
A. Proglottid
B. Filariformlarva
C. Rhabditiformlarva
D. Embryonated ovum

A

D

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16
Q

An intestinal parasite is seen in an iodine- stained fecal wet mount that is described as being 25 (Jim in diameter with a homogenously stained central body surrounded by a thin ring of cytoplasm containing a number of nuclei. This best describes
A. Blastocystis hominis
B. Endolimax nana
C. Entamoeba dispar
D. lodamoeba btitschlii

A

A

17
Q

Sanitary disposal of human feces is the most important factor in decreasing the incidence of most infections caused by intestinal parasites. Which of the following diseases would not be affected by that kind of sanitation?
A. Ascariasis
B. Taeniasis
C. Trichinosis
D. Hookworminfection

A

C

18
Q

Which of the following is the largest intestinal protozoa infecting humans?
A. Balantidium coli
B. Dientamoebafrag His
C. Entamoeba histolytica
D. Giardia lamblia

A

A

19
Q

The rhabditiform larvae of Strongyloides stercoralis
A. Mate and produce ova
B. Areinfectiveforhumans
C. Are the diagnostic form found in feces
D. Are found in the blood of infected
humans

A

C

20
Q

A Giemsa-stained thick blood film showed many ring forms with no older stages, and a number of the rings had double chromatin dots. These findings are characteristic of
A. Plasmodium falciparum
B. Plasmodium vivax
C. Plasmodium malariae
D. Plasmodium ovale

A

A

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