Parasitology Exam II Chapter
Questions and answers
Malaria parasite with 6 to 12 merozoites in the schizont✔✔Plasmodium malariae
C- or U-shaped body with a large kinetoplast✔✔T. cruzi
Large kidney-shaped nucleus✔✔Balantidium coli
Trophozite ingests red blood cells✔✔Entamoeba hystolytica
Large glycogen vacuole✔✔Iodamoeba butschlii
Schizonts not seen in peripheral blood✔✔Plasmodium falciparum, Cystoisospora
belli, Taxoplasma gondii
Pseudocysts in brain✔✔Taxoplasma gondii
Nonpathogenic✔✔Entomoeba hartmanni, Endolimax nana
Oocysts found in human feces✔✔Cystoisospora belli
Commonly causes relapses of malaria✔✔Plasmodium vivax
Transmitted by tsetse fly✔✔T. brucei gambiense
Pathogenic intestinal flagellate✔✔Giardia lambila
How would you differentiate Entamoeba hystolytica from entamoeba dispar in a fecal
smear?✔✔Both are morphologically identical. E. histolytica trophozoites will have
ingested RBCs. Further confirmation using immunologic procedures.
How would you differentiate entamoeba hystolytica from Entamoeba coli on a fecal
smear?✔✔In trophozoite: Study size, consistency, and inclusions (bacterial or
RBCs) in cytoplasm, directional vs. random motility, shape of pseudopodia, or
staining characteristics of nuclear structures.
In cysts: study size, number of nuclei, nuclear structure, shape of chromosomal
bodies, or vacuoles
Trophozoite✔✔Motile stage of a protozoon that feeds, multiplies, and maintains the
colony within the host
Cyst✔✔Immotile sage protected by a cyst wall formed by the parasite. The
protozoon is readily transmitted into a new host in this stage
, Sporozoite✔✔Plasmodium form that develops inside a sporocyst, invades the
salivary glands of a mosquito, and is transmitted to humans
Schizogony✔✔Asexual multiplication of Apicomplexa; multple intracellular nuclear
division precedes cytoplasmic division
Carrier✔✔A host harboring and disseminating a parasite but exhibiting no clinical
signs or symptoms
Oocyst✔✔Encysted form of the ookinete; occurs on the stomach wall of the
Anopheles spp. mosquitoes infected with malaria
Pseudocyst✔✔A cystlike structure formed by the host during an acute infection with
Toxoplasma gondii. The cyst is filled with tachyzoites in normal hosts; may occur in
the brain or other tissues. Latent source of infection that may become active if
immunosuppression occurs
L.D. body✔✔(Leishman-Donovan body) Each of the small ovoid amastigote forms
found in tissue macrophages of the liver and spleen in patients with Leishman-
Donovan infection
Paroxysm✔✔Fever-chills syndrome in malaria. Spiking fever corresponds to the
release of merozoites and toxic materials form the parazited RBC; shaking chills
occur during schizont development. Occurs in malaria clinically every 36 to 72 hours,
depending on the species
Atrium✔✔An opening; in humans referring to the mouth, vagina, and urethra
Method of infection for Kala-azar✔✔Bite of phlebotomus spp.
Method of infection for Giardiasis✔✔Ingestion of cyst in contaminated water or food
Method of infection for Chagas disease✔✔Infected feces of Triatoma spp. rubbed
into bite or conjunctiva
Method of infection for taxoplasmosis✔✔Ingestion of oocyst, trophozoite, or
pseudocyst; congenital transmission
Method of infection for Trichomonal urethritis✔✔In men, sexual intercourse; in
women, contamination with infectious material from vagina
Method of infection for Balantidial dysentary✔✔Infection of cyst in contaminated
water or food
Method of infection for Babesiosis✔✔Tick bite
Method of infection for malaria✔✔Bite of Anopheles mosquito; contaminated blood
injection
Questions and answers
Malaria parasite with 6 to 12 merozoites in the schizont✔✔Plasmodium malariae
C- or U-shaped body with a large kinetoplast✔✔T. cruzi
Large kidney-shaped nucleus✔✔Balantidium coli
Trophozite ingests red blood cells✔✔Entamoeba hystolytica
Large glycogen vacuole✔✔Iodamoeba butschlii
Schizonts not seen in peripheral blood✔✔Plasmodium falciparum, Cystoisospora
belli, Taxoplasma gondii
Pseudocysts in brain✔✔Taxoplasma gondii
Nonpathogenic✔✔Entomoeba hartmanni, Endolimax nana
Oocysts found in human feces✔✔Cystoisospora belli
Commonly causes relapses of malaria✔✔Plasmodium vivax
Transmitted by tsetse fly✔✔T. brucei gambiense
Pathogenic intestinal flagellate✔✔Giardia lambila
How would you differentiate Entamoeba hystolytica from entamoeba dispar in a fecal
smear?✔✔Both are morphologically identical. E. histolytica trophozoites will have
ingested RBCs. Further confirmation using immunologic procedures.
How would you differentiate entamoeba hystolytica from Entamoeba coli on a fecal
smear?✔✔In trophozoite: Study size, consistency, and inclusions (bacterial or
RBCs) in cytoplasm, directional vs. random motility, shape of pseudopodia, or
staining characteristics of nuclear structures.
In cysts: study size, number of nuclei, nuclear structure, shape of chromosomal
bodies, or vacuoles
Trophozoite✔✔Motile stage of a protozoon that feeds, multiplies, and maintains the
colony within the host
Cyst✔✔Immotile sage protected by a cyst wall formed by the parasite. The
protozoon is readily transmitted into a new host in this stage
, Sporozoite✔✔Plasmodium form that develops inside a sporocyst, invades the
salivary glands of a mosquito, and is transmitted to humans
Schizogony✔✔Asexual multiplication of Apicomplexa; multple intracellular nuclear
division precedes cytoplasmic division
Carrier✔✔A host harboring and disseminating a parasite but exhibiting no clinical
signs or symptoms
Oocyst✔✔Encysted form of the ookinete; occurs on the stomach wall of the
Anopheles spp. mosquitoes infected with malaria
Pseudocyst✔✔A cystlike structure formed by the host during an acute infection with
Toxoplasma gondii. The cyst is filled with tachyzoites in normal hosts; may occur in
the brain or other tissues. Latent source of infection that may become active if
immunosuppression occurs
L.D. body✔✔(Leishman-Donovan body) Each of the small ovoid amastigote forms
found in tissue macrophages of the liver and spleen in patients with Leishman-
Donovan infection
Paroxysm✔✔Fever-chills syndrome in malaria. Spiking fever corresponds to the
release of merozoites and toxic materials form the parazited RBC; shaking chills
occur during schizont development. Occurs in malaria clinically every 36 to 72 hours,
depending on the species
Atrium✔✔An opening; in humans referring to the mouth, vagina, and urethra
Method of infection for Kala-azar✔✔Bite of phlebotomus spp.
Method of infection for Giardiasis✔✔Ingestion of cyst in contaminated water or food
Method of infection for Chagas disease✔✔Infected feces of Triatoma spp. rubbed
into bite or conjunctiva
Method of infection for taxoplasmosis✔✔Ingestion of oocyst, trophozoite, or
pseudocyst; congenital transmission
Method of infection for Trichomonal urethritis✔✔In men, sexual intercourse; in
women, contamination with infectious material from vagina
Method of infection for Balantidial dysentary✔✔Infection of cyst in contaminated
water or food
Method of infection for Babesiosis✔✔Tick bite
Method of infection for malaria✔✔Bite of Anopheles mosquito; contaminated blood
injection
