Parasitology Final Exam Review Questions
And Answers
If fecal specimens are to be preserved for the preparation of permanent slides, what would be the
preservative of choice? PVA (Polyvinyl Alcohol)
Which specimen is the LEAST likely to provide recovery of Trichomonas vaginalis? feces
In what suspected condition should a wet prep using a warm slide be examined? Amoebic
meningoencephalitis
An unpreserved fecal specimen has been accidentally left at room temperature in the laboratory
overnight. Upon examination the next day, you find many motile "larvae" which measure about
250 and have short buccal capsules and prominent genital primordium, but no ova are found.
Identification of this organism is: Strongyloides stercoralis, rhabditiform larva
The use of the trichrome stained smear in parasitology is advantageous in that it best
demonstrates the details of the _________ stage which may not be seen as easily in other
microscopic preparations trophozoite
Which of the following animals acts as a reservoir of infection of Balantidium coli? pigs
, Parasitology Final Exam Review Questions
And Answers
A cyst of Iodamoeba butschlii would typically show: a glycogen mass
Bloody, diarrheic stools would most likely contain which of the following parasites?
Entamoeba histolytica
The most characteristic feature of Endolimax nana it its: blot-like nucleus and clear
cytoplasm
Organisms that should be considered in a waterborne outbreak of diarrheal disease include:
Giardia lamblia and Cryptosporidium parvum
Which of the following is the BEST technique to identify Dientamoeba fragilis in stool?
Trichrome stained smear
Eye infections with Acanthamoeba spp. have most commonly been traced to: use of
contaminated lens cleaning solutions
, Parasitology Final Exam Review Questions
And Answers
A host in which a parasite does not reach its sexual maturity and reproduction is a/an
Intermediate host
Macroscopic examination of unpreserved, fresh stool specimens involves briefly looking for:
mucus, blood, adult worms
Permanent stained smears CANNOT be made from: formalin preserved specimens
A patient presented with the following symptoms: mild gastrointestinal complaints, vitamin A
deficiency, and steatorrheal (fat in stool) stool specimens. Five stool specimens were submitted
within two weeks. All O and P exams were reported negative. Select the next most appropriate
step: request a duodenal aspirate for parasitic exam
Motile protozoan trophozoites initially seen in wet preps should not be reported as positively
identified until they are similarly viewed on permanently stained smear True
Blastocystis hominis is: a protozoan that has a large, fluid filled vacuole surrounded by
one to several nuclei
, Parasitology Final Exam Review Questions
And Answers
Blastocystis hominis is a: protozoan
Schizogony is: asexual reproduction by multiple fission
Cryptosporidium sp. is most similar to what other organism? Isospora belli
Which constitutes the MOST important preventative measure to decrease the incidence of
parasitic disease? improved public sanitation
What stain is BEST used to identify Isospora belli? modified acid fast
An 85-year-old woman was admitted to the hospital with abdominal cramps and diarrhea of
approximately one week's duration. She appeared cachectic and severely dehydrated and gave a
history of eating poorly for several months prior to the onset of the above symptoms. The direct
wet prep of her fecal specimen revealed an oval ciliated trophozoite measuring approximately 90
microns and containing a funnel shaped cytostome and a kidney-shaped nucleus. Other
inclusions were not visible. This organism is identified as: Balantidium coli
And Answers
If fecal specimens are to be preserved for the preparation of permanent slides, what would be the
preservative of choice? PVA (Polyvinyl Alcohol)
Which specimen is the LEAST likely to provide recovery of Trichomonas vaginalis? feces
In what suspected condition should a wet prep using a warm slide be examined? Amoebic
meningoencephalitis
An unpreserved fecal specimen has been accidentally left at room temperature in the laboratory
overnight. Upon examination the next day, you find many motile "larvae" which measure about
250 and have short buccal capsules and prominent genital primordium, but no ova are found.
Identification of this organism is: Strongyloides stercoralis, rhabditiform larva
The use of the trichrome stained smear in parasitology is advantageous in that it best
demonstrates the details of the _________ stage which may not be seen as easily in other
microscopic preparations trophozoite
Which of the following animals acts as a reservoir of infection of Balantidium coli? pigs
, Parasitology Final Exam Review Questions
And Answers
A cyst of Iodamoeba butschlii would typically show: a glycogen mass
Bloody, diarrheic stools would most likely contain which of the following parasites?
Entamoeba histolytica
The most characteristic feature of Endolimax nana it its: blot-like nucleus and clear
cytoplasm
Organisms that should be considered in a waterborne outbreak of diarrheal disease include:
Giardia lamblia and Cryptosporidium parvum
Which of the following is the BEST technique to identify Dientamoeba fragilis in stool?
Trichrome stained smear
Eye infections with Acanthamoeba spp. have most commonly been traced to: use of
contaminated lens cleaning solutions
, Parasitology Final Exam Review Questions
And Answers
A host in which a parasite does not reach its sexual maturity and reproduction is a/an
Intermediate host
Macroscopic examination of unpreserved, fresh stool specimens involves briefly looking for:
mucus, blood, adult worms
Permanent stained smears CANNOT be made from: formalin preserved specimens
A patient presented with the following symptoms: mild gastrointestinal complaints, vitamin A
deficiency, and steatorrheal (fat in stool) stool specimens. Five stool specimens were submitted
within two weeks. All O and P exams were reported negative. Select the next most appropriate
step: request a duodenal aspirate for parasitic exam
Motile protozoan trophozoites initially seen in wet preps should not be reported as positively
identified until they are similarly viewed on permanently stained smear True
Blastocystis hominis is: a protozoan that has a large, fluid filled vacuole surrounded by
one to several nuclei
, Parasitology Final Exam Review Questions
And Answers
Blastocystis hominis is a: protozoan
Schizogony is: asexual reproduction by multiple fission
Cryptosporidium sp. is most similar to what other organism? Isospora belli
Which constitutes the MOST important preventative measure to decrease the incidence of
parasitic disease? improved public sanitation
What stain is BEST used to identify Isospora belli? modified acid fast
An 85-year-old woman was admitted to the hospital with abdominal cramps and diarrhea of
approximately one week's duration. She appeared cachectic and severely dehydrated and gave a
history of eating poorly for several months prior to the onset of the above symptoms. The direct
wet prep of her fecal specimen revealed an oval ciliated trophozoite measuring approximately 90
microns and containing a funnel shaped cytostome and a kidney-shaped nucleus. Other
inclusions were not visible. This organism is identified as: Balantidium coli
