AVS 3305 PARASITOLOGY – PROTOZOA
PRACTICE EXAM QUESTIONS WITH VERIFIED
ANSWERS
Define "Trophozoite".
Active, motile, feeding, and multiplying stage of protozoa.
Define "Bradyzoite"
Dormant stage in protozoa.
Describe the morphology of flagellates.
At least one flagellum.
Describe the morphology of amoebas.
Amorphous shape, pseudopodia ("false feet" - temporary projection in the direction of
movement).
Describe the morphology of ciliates.
Short, hair-like projections (undulating movement facilitates motion).
Describe the morphology of apicomplexans.
banana-shaped, external locomotory organelles not apparent (moves via undulations).
What type of protozoa is Giardia spp?
Flagellate.
List the types of animals that Giardia spp. can infect.
Dogs, cats, equine, ruminant, exotics, humans.
Assign the animals associated with each assemblage (A-H) of Giardia.
A, B - Animals including humans
C, D - Dogs
E - Cattle, sheep, goats, horses, pigs
F - Cats
G - Rodents
H - Pinnipeds
List the two forms of Giardia, and describe each.
1. Trophozoite: motile, pear-shaped, 4 flagella paris, 2 nuclei
2. Cyst: oval, 4 nuclei, resistant
, How can you diagnose the trophozoite and cyst stages of Giardia?
Trophozoite: direct fecal smear
Cyst: fecal floatation, zinc sulfate centrifugation, sheather sugar solution, ELISA test
What are some treatment options for Giardia?
Panacur (Fenbendazole), clean and disinfect environment thoroughly, bathe pet often.
Describe the life cycle of Giardia.
- Cysts passed in the feces are ingested by a new host
- Excystation occurs in the SI, and trophozoites are released
- Trophozoites, some migrate to lumen, divide via binary fission
- Encystation occurs in distal SI or LI, trophozoites develop into cysts
- Cysts exit the host (passed in feces)
Can re-infect!
What type of protozoa is Entamoeba histolytica?
Amoeba.
Where can Entamoeba histolytica be found?
Large intestine.
What animals can Entamoeba histolytica infect?
Canines, felines, primates, humans.
What disease can Entamoeba histolytica cause?
Amebic Dysentery.
What are the two forms of Entamoeba histolytica?
Trophozoite, and cyst.
What are two methods for diagnosing Entamoeba histolytica?
Direct fecal smear, or fecal floatation.
Describe the life cycle of Entamoeba histolytica.
- Cysts passed in feces are ingested by a new host
- Excystation occurs in SI
- Trophozoites develop and migrate to LI
- Trophozoites may remain in lumen or invade mucosa and gain access to vessels (liver, brain,
lungs)
- Trophozoites divide via binary fission
PRACTICE EXAM QUESTIONS WITH VERIFIED
ANSWERS
Define "Trophozoite".
Active, motile, feeding, and multiplying stage of protozoa.
Define "Bradyzoite"
Dormant stage in protozoa.
Describe the morphology of flagellates.
At least one flagellum.
Describe the morphology of amoebas.
Amorphous shape, pseudopodia ("false feet" - temporary projection in the direction of
movement).
Describe the morphology of ciliates.
Short, hair-like projections (undulating movement facilitates motion).
Describe the morphology of apicomplexans.
banana-shaped, external locomotory organelles not apparent (moves via undulations).
What type of protozoa is Giardia spp?
Flagellate.
List the types of animals that Giardia spp. can infect.
Dogs, cats, equine, ruminant, exotics, humans.
Assign the animals associated with each assemblage (A-H) of Giardia.
A, B - Animals including humans
C, D - Dogs
E - Cattle, sheep, goats, horses, pigs
F - Cats
G - Rodents
H - Pinnipeds
List the two forms of Giardia, and describe each.
1. Trophozoite: motile, pear-shaped, 4 flagella paris, 2 nuclei
2. Cyst: oval, 4 nuclei, resistant
, How can you diagnose the trophozoite and cyst stages of Giardia?
Trophozoite: direct fecal smear
Cyst: fecal floatation, zinc sulfate centrifugation, sheather sugar solution, ELISA test
What are some treatment options for Giardia?
Panacur (Fenbendazole), clean and disinfect environment thoroughly, bathe pet often.
Describe the life cycle of Giardia.
- Cysts passed in the feces are ingested by a new host
- Excystation occurs in the SI, and trophozoites are released
- Trophozoites, some migrate to lumen, divide via binary fission
- Encystation occurs in distal SI or LI, trophozoites develop into cysts
- Cysts exit the host (passed in feces)
Can re-infect!
What type of protozoa is Entamoeba histolytica?
Amoeba.
Where can Entamoeba histolytica be found?
Large intestine.
What animals can Entamoeba histolytica infect?
Canines, felines, primates, humans.
What disease can Entamoeba histolytica cause?
Amebic Dysentery.
What are the two forms of Entamoeba histolytica?
Trophozoite, and cyst.
What are two methods for diagnosing Entamoeba histolytica?
Direct fecal smear, or fecal floatation.
Describe the life cycle of Entamoeba histolytica.
- Cysts passed in feces are ingested by a new host
- Excystation occurs in SI
- Trophozoites develop and migrate to LI
- Trophozoites may remain in lumen or invade mucosa and gain access to vessels (liver, brain,
lungs)
- Trophozoites divide via binary fission
