Parasitology Test Questions with Correct Answers Latest Update 2025 Graded A+
The direct wet mount as part of the O&P (ova and parasite) examination: - Answers Requires freshly
passed unpreserved stool
The concentration part of the O&P (ova and parasite) examination: - Answers Is designed to allow
detection of protozoan cysts, coccidian oocysts
The permanent stained smear part of the O&P (Ova and parasite) examination: - Answers Requires
freshly passed, unpreserved stool, is designed to allow detection of protozoan cysts, coccidian oocysts,
microsporidial spores, and helminth eggs and larvae, is examined microscopically at low, high dry, and
oil immersion magnifications, is designed to facilitate identification of intestinal protozoa, ALL CORRECT
The eggs of which intestinal parasite are not commonly found in feces an must be detected by other
diagnostic techniques? - Answers Enterobius vermicularis
Sputum may be submitted for examination for which parasite? - Answers Ascaris lumbricoides
Stronglyoides stercoralis
Paragonimus westermani
Echinococcus granulosus
ALL CORRECT
The examination of spinal fluid may reveal the parasitic agent of meningoencephalitis called - Answers
Naegleria fowleri
The most common larvae found in stool specimens is: - Answers Strongyloides stercoralis
An amoebic trophozoite that can be descried as 15 to 20 microns with fine uniform nuclear peripheral
chromatin central karyosome and finely granular cytoplasm would most likely be: - Answers Entamoeba
histolytica
An amoebic trophozoite that can be described as 12 to 15 microns with no nuclear peripheral
chromatin, a large karyosome, and coarsely granular and highly vacuolated cytoplasm would most likely
be: - Answers Iodamoeba butschlii
A flagellate trophozoite that can be described as 9 to 12 um, with one to two nuclei with no nuclear
peripheral chromatin, a karyosome composed of four to eight large granules, and finely granular
cytoplasm would most likely be: - Answers Dientamoeba fragilis
A red blood cell parasite that can be described as infecting younger RBCs having Schuffners dots,
presenting in all stages, and having 12 to 24 merozoites would most likely be: - Answers Plasmodium
vivax
, A red blood cell parasite that can be described as infecting older and younger RBCs presenting in mostly
young ring forms, and having a crescent shaped or banana gametocyte would most likely be: - Answers
Plasmodium falciparum
The schistosoma species with a prominent lateral spine is: - Answers Schistosoma mansoni
When amebiasis is strongly indicated but no parasitic forms are detected from any of three submitted
fecal samples, the next step might be: - Answers To collect material obtained from sigmoidoscopy and
examine for parasites
The specimen of choice for diagnosing infection with Leishmani spp is: - Answers Liver tissue
When concentrating specimens one problem with the zinc sulfate flotation method is: - Answers Larva
are destroyed
An advantage of sedimenting stool specimens using formalin ether concentration is: - Answers There is
no need to centrifuge
The trophozoite of entamoeba histolytica: - Answers Is binucleate
The intestinal amoeba whose cyst contains a glycogen mass is: - Answers Iodamoeba butschlii
Naegleria: - Answers Trophozoites can transform into a pear shaped flagellate, is the cause of primary
amoebic meiningoencephalitis, shows progressive motility, ALL CORRECT
An intestinal flagellate whose trophozoite form has two nuclei with central karysomes, a ventral sucking
disk, with a pointed anterior end, and bilateral symmetry is: - Answers Giardia lamblia
The sexual cycle of Toxoplasma gondii occurs in: - Answers Cats
Plasmodium falciparum: - Answers Has a crescent shaped gametocyte
Chagas disease is diagnosed by observation: - Answers C-shaped trypomastigotes in blood smears
The first intermediate host for the flatworms is the: - Answers Snail
The intestinal coccidian: - Answers Are generally identified using the modified acid fast stain
Trypanosoma brucei gambiense is not endemic to the united states because the appropriate: - Answers
Vector does not exist
A parasite that is capable of infecting both man and animal increases its chances of survival. It is
described as: - Answers Enzoonotic
A physician suspects her patient has Paragonimus westermani based on the patients physical and
history. A stool sample is submitted for ova and parasite examination and is negative. You suggest the
collection of a ______ specimen to assist with the diagnosis. - Answers Sputum
The direct wet mount as part of the O&P (ova and parasite) examination: - Answers Requires freshly
passed unpreserved stool
The concentration part of the O&P (ova and parasite) examination: - Answers Is designed to allow
detection of protozoan cysts, coccidian oocysts
The permanent stained smear part of the O&P (Ova and parasite) examination: - Answers Requires
freshly passed, unpreserved stool, is designed to allow detection of protozoan cysts, coccidian oocysts,
microsporidial spores, and helminth eggs and larvae, is examined microscopically at low, high dry, and
oil immersion magnifications, is designed to facilitate identification of intestinal protozoa, ALL CORRECT
The eggs of which intestinal parasite are not commonly found in feces an must be detected by other
diagnostic techniques? - Answers Enterobius vermicularis
Sputum may be submitted for examination for which parasite? - Answers Ascaris lumbricoides
Stronglyoides stercoralis
Paragonimus westermani
Echinococcus granulosus
ALL CORRECT
The examination of spinal fluid may reveal the parasitic agent of meningoencephalitis called - Answers
Naegleria fowleri
The most common larvae found in stool specimens is: - Answers Strongyloides stercoralis
An amoebic trophozoite that can be descried as 15 to 20 microns with fine uniform nuclear peripheral
chromatin central karyosome and finely granular cytoplasm would most likely be: - Answers Entamoeba
histolytica
An amoebic trophozoite that can be described as 12 to 15 microns with no nuclear peripheral
chromatin, a large karyosome, and coarsely granular and highly vacuolated cytoplasm would most likely
be: - Answers Iodamoeba butschlii
A flagellate trophozoite that can be described as 9 to 12 um, with one to two nuclei with no nuclear
peripheral chromatin, a karyosome composed of four to eight large granules, and finely granular
cytoplasm would most likely be: - Answers Dientamoeba fragilis
A red blood cell parasite that can be described as infecting younger RBCs having Schuffners dots,
presenting in all stages, and having 12 to 24 merozoites would most likely be: - Answers Plasmodium
vivax
, A red blood cell parasite that can be described as infecting older and younger RBCs presenting in mostly
young ring forms, and having a crescent shaped or banana gametocyte would most likely be: - Answers
Plasmodium falciparum
The schistosoma species with a prominent lateral spine is: - Answers Schistosoma mansoni
When amebiasis is strongly indicated but no parasitic forms are detected from any of three submitted
fecal samples, the next step might be: - Answers To collect material obtained from sigmoidoscopy and
examine for parasites
The specimen of choice for diagnosing infection with Leishmani spp is: - Answers Liver tissue
When concentrating specimens one problem with the zinc sulfate flotation method is: - Answers Larva
are destroyed
An advantage of sedimenting stool specimens using formalin ether concentration is: - Answers There is
no need to centrifuge
The trophozoite of entamoeba histolytica: - Answers Is binucleate
The intestinal amoeba whose cyst contains a glycogen mass is: - Answers Iodamoeba butschlii
Naegleria: - Answers Trophozoites can transform into a pear shaped flagellate, is the cause of primary
amoebic meiningoencephalitis, shows progressive motility, ALL CORRECT
An intestinal flagellate whose trophozoite form has two nuclei with central karysomes, a ventral sucking
disk, with a pointed anterior end, and bilateral symmetry is: - Answers Giardia lamblia
The sexual cycle of Toxoplasma gondii occurs in: - Answers Cats
Plasmodium falciparum: - Answers Has a crescent shaped gametocyte
Chagas disease is diagnosed by observation: - Answers C-shaped trypomastigotes in blood smears
The first intermediate host for the flatworms is the: - Answers Snail
The intestinal coccidian: - Answers Are generally identified using the modified acid fast stain
Trypanosoma brucei gambiense is not endemic to the united states because the appropriate: - Answers
Vector does not exist
A parasite that is capable of infecting both man and animal increases its chances of survival. It is
described as: - Answers Enzoonotic
A physician suspects her patient has Paragonimus westermani based on the patients physical and
history. A stool sample is submitted for ova and parasite examination and is negative. You suggest the
collection of a ______ specimen to assist with the diagnosis. - Answers Sputum
