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PARASITOLOGY - HARR with 100% correct answers 2024
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The incorrect match between organism and the appropriate diagnostic procedure is: A. Onchocerca volvulus—examination of skin snips B. Cryptosporidium—modified acid-fast stain C. Echinococcus granulosus—routine ova and parasite examination D. Schistosoma haematobium—examination of urin...

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  • September 12, 2024
  • 22
  • 2024/2025
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PARASITOLOGY - HARR with
100% correct answers 2024
The incorrect match between organism and the appropriate
diagnostic procedure is:


A. Onchocerca volvulus—examination of skin snips
B. Cryptosporidium—modified acid-fast stain
C. Echinococcus granulosus—routine ova and parasite examination
D. Schistosoma haematobium—examination of urine sediment -
answer C. Echinococcus granulosus—routine ova and parasite
examination


In a patient with diarrhea, occasionally Entamoeba histolytica/E.
dispar (four nucleated cysts, no chromatoidal bars) are identified as
being present; however, these cells, which are misdiagnosed as
protozoa, are really:


A. Macrophages
B. Polymorphonuclear leukocytes
C. Epithelial cells
D. Eosinophils - answer B. Polymorphonuclear leukocytes


Charcot-Leyden crystals in stool may be associated with an immune
response and are thought to be formed from the breakdown
products of:


A. Neutrophils
B. Eosinophils
C. Monocytes

,D. Lymphocytes - answer B. Eosinophils


Parasitic organisms that are most often transmitted sexually
include:


A. Entamoeba gingivalis
B. Dientamoeba fragilis
C. Trichomonas vaginalis
D. Diphyllobothrium latum - answer C. Trichomonas vaginalis


The incorrect match between the organism and one method of
acquiring the infection is:


A. Trypanosoma brucei rhodesiense—bite of sand fleas
B. Giardia lamblia—ingestion of water contaminated with cysts
C. Hookworm—skin penetration of larvae from soil
D. Toxoplasma gondii—ingestion of raw or rare meats - answer A.
Trypanosoma brucei rhodesiense—bite of sand fleas


Upon examination of stool material for Cystoisospora belli, one
would expect to see:


A. Cysts containing sporozoites
B. Precysts containing chromatoidal bars
C. Oocysts that are modified acid-fast variable
D. Sporozoites that are hematoxylin positive - answer C. Oocysts
that are modified acid-fast variable


Which specimen is the least likely to provide recovery of
Trichomonas vaginalis?

, A. Urine
B. Urethral discharge
C. Vaginal discharge
D. Feces - answer D. Feces


Which of the following is the best technique to identify
Dientamoeba fragilis in stool?
A. Formalin concentrate
B. Trichrome-stained smear
C. Modified acid-fast-stained smear
D. Giemsa's stain - answer B. Trichrome-stained smear


One of the following protozoan organisms has been implicated in
waterborne and foodborne outbreaks within the United States. The
suspect organism is:
A. Pentatrichomonas hominis
B. Dientamoeba fragilis
C. Giardia lamblia
D. Balantidium coli - answer C. Giardia lamblia


A Gram stain from a gum lesion showed what appeared to be
amoebae. A trichrome smear showed amoebae with a single nucleus
and partially digested PMNs. The correct identification is:
A. Trichomonas tenax
B. Entamoeba histolytica/E. dispar
C. Entamoeba gingivalis
D. Entamoeba polecki - answer C. Entamoeba gingivalis

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