Parasitology questions and answers

PARASITOLOGY MCQS
DCM CLASS 2016
Questions and Answers
 1.
A 42-year-old pt with AIDS presents to your office with chronic, intractable,
debilitating diarrhea. He says it began not long after returning from a camping
trip. He admits to drinking water from a stream without using a filter or boiling it.
You perform a GSA(Giardia Stool Antigen) test which comes back negative.
What is his likely diagnosis?
Discuss
o A.
Amebiasis
o B.
Giardia
o C.
Cryptosporidium Parvum
o D.
P. Falciparum
o E.
Leishmaniasis
 2.
What is the primary cause of Amebiasis?
o A.
T. Gondii
o B.

Entamoeba Histolytica
o C.
P. Carinii
o D.
D. Latum
o E.
None of the Above
 3.
A 24-year-old male pt presents to your office with a fever, head ache, and
lethargy. He has recently returned from a medical mission, which placed him in
many underserved African villages. Your physical exam confirms the fever and
also reveals significant lymphadenopathy. His girlfriend states she has noticed
increased irritability over the past few days. Given the symptoms and history,
what is the most likely diagnosis?
Discuss
o A.
American Trypanosomiasis
o B.
Sleeping Sickness
o C.
Malaria
o D.
Toxoplasmosis
o E.
Orchitis
 4.

The process by which uninfected bugs are allowed to feed on a pts blood, then
the gut contents are examined for parasites 4-6 weeks later is called
____________.
Discuss
o A.
Xenodiagnosis
o B.
SPI (Secondary Parasitic Identification)
o C.
NIPLE (Non-Invasive Parasitic Larvae Examination)
o D.
Parasitic Host-Typing
o E.
Goodfellow's Test
 5.
Which of the following is true of Malaria?
Discuss
o A.
Old men and young children do not get Malaria.
o B.
You get it from eating undercooked fish.
o C.
It is strongly linked to Amoeba Naegleri Fowleri.
o D.
Must seek CDC involvement in the diagnosis, treatment, and management of Malaria.

o E.
It is caused by swimming in warm, fresh water.
Questions and Answers
 1.
You find these worms on the fecal of an 8 week old puppy. Which de-wormer
should you use to treat him?
Discuss
o A.
Pyrantel
o B.
Fenbendazole
o C.
Ponazuril

o D.
Milbemycine oxime
 2.
Your client wants to start breeding Chischnachsunds because "They are so cute
and tiny! And I will be rich!". She wants to make sure the puppies are born worm
free, which wormer would you prescribe?
o A.
Pyrantel
o B.
Ponazuril
o C.
Ivermectin
o D.
Fenbendazole
o E.
Febantel
 3.

On your way to work you notice this in your yard. Besides more conscientious
owners, what does this dog need?
o A.
Fipronil
o B.
Fenbendazole
o C.
Praziquantel
o D.
Ivermectin
 4.

These worms can be treated with pyrantel.
o A.
True
o B.
False
 5.
Fenbendazole treats which parasites?
Discuss
o A.
Ascarids
o B.

Strongyles
o C.
Whipworms
o D.
Diplyidium caninum
o E.
Taenia pisiformis
o F.
Giardia
 6.
Ponazuril is a coccidiostatic medication
o A.
True
o B.
False
 7.
You find this parasite in the fecal of a dog. Which treatment should you use?
o A.

Ponazuril
o B.
Febantel
o C.
Ivermectin
o D.
Nothing because this is a psuedoparasite.
o E.
Amprolium
 8.
Sulfonamides are coccidiostats that can be used in dogs.
o A.
True
o B.
False
 9.
Melarsomine is used to treat what parasite?
o A.
Heartworm microfilariae
o B.
Adult heartworms
o C.
Whipworms
o D.

Ascarids
 10.
Feline heartworm infection can be treated with melarsomine.
o A.
True
o B.
False
 11.
Doxycyline is used as an adjunct heartworm therapy because:
o A.
It kills microfilariae
o B.
It damages the tegument of adult worms
o C.
It kills the commensal bacteria Wolbachia
o D.
It lessens negative side effects of arsenical treatment
 12.
Cats can develop HARD syndrome when infected with heartworms. This
acronym stands for _______ ________ _________ ________.
 13.
The heartworm infection rate of cats is what percentage that of dogs?
o A.
80%

o B.
60%
o C.
5%
o D.
10%
o E.
2%
 14.
This wombat was likely diagnosed using which method?
o A.
PCR
o B.
Skin scrape
o C.
Scotch Tape Test
o D.

Culture
 15.
______ ___________, also known as frounce, is a disease of pigeons and birds
of prey. It forms cheesy plaques on muscosal surfaces in the mouth, esophagus
and crop.
 16.
Your cousin won a goldfish at the state fair and wants to put it in your prized
African cichlid tank. This would not be a good idea because it is likely infected
with:
o A.
Nothing, its just that goldfish do not represent the same socioeconomic bracket as
cichlids.
o B.
Ichthyopthirius multifiliis
o C.
Neoricketsia salmincola
o D.
Dropsy
 17.
Toxoplasma gondii does not infect birds
Discuss
o A.
True
o B.
False
 18.
This parasite makes it a bad idea to eat raw or undercooked fish

o A.
Anisakis
o B.
Cryptosporidium
o C.
Heterakis meleagridis
o D.
Fugu
 19.
Pork is the number one meat in the USA that contains Trichinella
o A.
True
o B.
False
 20.
This rabbit probably is infested with _________ _________.

 21.
The only reason a client could be immunocompromised is because of HIV/AIDS
infection.
o A.
True
o B.
False
 22.
A pregnant woman can become infected with T. gondii by which of the
following?
Discuss
o A.
Cuddling with her cat
o B.
Eating undercooked meat
o C.
Gardening without gloves and putting hands in her mouth
o D.
Eating unwashed fruits of veggies
o E.
Drinking contaminated water
o F.
Changing the litter box with gloves on
 23.
Clinical toxoplasmosis is fairly common

Discuss
o A.
True
o B.
False
 24.
Most animal strains of Giardia are zoonotic
o A.
True
o B.
False
 25.
Jurassic Park is no longer just science fiction. You are the very first veterinarian
ever to perform a fecal on a triceratops, how lucky! You find this parasite on the
fecal and decide the best drug to use would be:

o A.
Ivermectin
o B.
Moxidectin
o C.
Milbemycin
o D.
Fenbendazole
 26.
Composting dog feces will kill any viable eggs.
o A.
True
o B.
False
 27.
Starting refugia is a new goal of parasite control in large animals
o A.
True
o B.
False
 28.
There are a variety of ways to control parasites in large animals, without
constant deworming. These include:
o A.
Culling infected animals

o B.
Rotational grazing
o C.
Prescribed pasture burns
o D.
Tillage
o E.
Removal of feces
o F.
Spraying insecticides on pasture
 29.
Co-grazing mixed species reduces parasite load due to the ________ _____.
 30.

It would be perfectly ok to treat the animal this parasite was found in with a 5x
dosage of Praziquantel for two days.
o A.
True
o B.
False
 31.
Humans can get scabies from their dogs.
o A.
True
o B.
False
 1.
It is the largest roundworm.
Discuss
o A.
Enterobius vermicularis
o B.
Ascaris lumbricoides
o C.
Strongyloides stercoralis
o D.
Ancylostoma duodenale
 2.
Which of the following is not a pathophysiology of A. lumbricoides?

o A.
Ascariasis
o B.
Roundworm infection
o C.
Loeffler's Syndrome
o D.
Cochin China Disease
 3.
It is associated with Rectal Prolapse and Peristalsis.
o A.
Entobius vermicularis
o B.
Trichuris trichiura
o C.
o D.
None of the above
 4.
It resembles a pencil lead thickness.
o A.
Male Ascaris lumbricodes
o B.
Fertilized egg of Ascaris lumbricodes

o C.
Unfertilized egg of Ascaris lumbricodes
o D.
Female Ascaris lumbricodes
 5.
It is a secretory product of the egg and it is chitinous.
o A.
Chorionic Shell
o B.
Vitelline membrane
o C.
True shell
o D.
Both a and c
 6.
It is a tubular or funnel-shaped for sucking purposes.
o A.
Esophagus
o B.
Buccal cavity
o C.
Mouth
o D.
Anus

 7.
It is the outermost layer of an ovum and has a tanning action.
o A.
Albuminous layer
o B.
Vitelline Membrane
o C.
Chitin
o D.
True shell
 8.
An esophageal type that is long, tube-like muscled cells.
o A.
Rhabditis type
o B.
Stichosome type
o C.
Filarial type
o D.
Both a and c
 9.
It is a thin needle-like that injects spermatozoa through the seminal vesicle.
o A.
Copulatory spicules

o B.
Copulatory bursa
o C.
Both a and b
o D.
None of the above
 10.
It is a muscular tube that pumps food posteriorly.
o A.
Esophagus
o B.
Buccal Cavity
o C.
Mouth
o D.
Intestine
 11.
It is used for grasping female nematode during copulation.
o A.
Copulatory spicules
o B.
Copualtory bursa
o C.
Both a and b

o D.
None of the above
 12.
It is firmed immediately after sperm penetration. A waxy, colorless lipoidal in nature.
o A.
Vitelline membrane
o B.
Fertilization membrane
o C.
Both a and b
o D.
True layer
 13.
It is an esophageal type made up of chain of basophilic granular myocytes.
o A.
Filarial type
o B.
Rhabditis type
o C.
Stichosome type
o D.
None of the above
 14.
Classification of female adult wherein ova is released.

o A.
Oviparous
o B.
Viviparous
o C.
Pathenogenic
o D.
None of the above
 15.
Classification of female adult wherein larva is released.
o A.
Parthenogenic
o B.
Viviparous
o C.
Larviparous
o D.
All, except a
 16.
Classification of female adult wherein it can produce viable eggs without being fertilized
by the male worms.
o A.
Parthenogenic
o B.
Viviparous

o C.
Larviparous
o D.
Oviparous
 17.
Match the following nematodes according to esophageal types.
o A. Filarial type
o A.
Select a Match
o B. Rhabditis type
o B.
Select a Match
o C. Stichosome type
o C.
Select a Match
 18.
Match the following nematodes according to classification of Female Adult.
o A. Oviparous
o A.
Select a Match
o B. Viviparous
o B.
Select a Match
o C. Parthenogenic
o C.
Select a Match
 19.
Choose the following that lives in the Large Intestine
o A.
Trichuris trichiura
o B.
o C.
Hookworms
o D.

o E.
Capillaria philippinensis
 20.
Choose the nematodes that inhabit the Small Intestine
o A.
o B.
o C.
Trichuris trichiura
o D.
o E.
Hookworms
o F.
 21.
Match the following nematodes with their common names.
o A. Ascaris lumbricoides
o A.
Select a Match
o B. Ancylostoma duodenale
o B.
Select a Match
o C. Necator americanus
o C.
Select a Match
o D. Trichinella spiralis
o D.
Select a Match
o E. Trichuris trichiura

o E.
Select a Match
o F. Enterobius vermicularis
o F.
Select a Match
o G. Strongyloides stercoralis
o G.
Select a Match
o H. Capillaria philippinensis
o H.
Select a Match
 22.
Which of the following is the Direct Transmission of Strongyloides stercoralis?
o A.
Rhabditiform -> Larva -> Feces -> Filariform in environment
o B.
Rhabditiform -> Free-living State
o C.
Rhabditiform -> (Free-living) Filariform
o D.
None of the above
 23.
It has a characteristic of creamy white color with pink tint.
o A.
o B.
Trichinella spiralis
o C.
o D.
Trichuris trichiura

 24.
It is associated with Microcytic Hypochronic Anemia.
o A.
Necator americanus
o B.
o C.
o D.
Both a and b
 25.
The egg of this nematode is Letter "D" or loopsided.
o A.
o B.
Trichuris trichiura
o C.
o D.
 26.
Most preferred laboratory diagnosis of Enterobius vermicularis.
o A.
ELISA

o B.
Direct Fecal Smear
o C.
Cellophane tape preparation
o D.
Knott Technique
 27.
It is associated with ulcerative colitis.
o A.
Trichuris trichiura
o B.
o C.
o D.
Dracunculus medinensis
 28.
Which of the following is not associated with Strongyloides stercoralis?
o A.
Cutaneous larval migrans
o B.
Cochin china disease
o C.
Strongyloidiasis

o D.
Urticaria
 29.
Which of the following is not a treatment of choice in treating nematodes?
o A.
Albendazole
o B.
Mebendazole
o C.
Pyrantel pamoate
o D.
Doxycycline
 30.
It is a characteristic of an ova of Capillaria philippinensis.
o A.
Chinese letter palisade
o B.
D shape
o C.
Peanut shaped
o D.
Japanese lantern
 31.
Nematode that inhibits striated muscles

o A.
Trichina worm
o B.
Pudoc worm
o C.
Threadworm
o D.
 32.
Nematode that inhibits the subcutaneous tissue.
o A.
Pinworm
o B.
Fiery serpent worm
o C.
Guinea worm
o D.
Both b and c
 33.
It is acquired through the ingestion of undercooked contaminated meat (striated muslce).
o A.
Trichina worm
o B.
Pudoc worm

o C.
Threadworm
o D.
Guinea worm
 34.
Match the following with the characteristics of their tail.
o A. Male E. vermicularis
o A.
Select a Match
o B. Male A. lumbricoides
o B.
Select a Match
o C. Filariform Larvae of S. stercoralis
o C.
Select a Match
 35.
It causes oxyuriasis.
o A.
o B.
Trichuris trichiura
o C.
o D.
Hookworms
 36.
It is acquired through the ingestion of contaminated water containing copepods with L3
Larvae.
o A.

o B.
Guinea worm
o C.
Fiery serpent worm
o D.
All of the above
 37.
It is an intermediate host of Capillaria philippinensis.
o A.
Brackish water fish
o B.
Humans
o C.
Migratory Birds
o D.
Copepods
 38.
It causes the mystery disease.
o A.
o B.
o C.

o D.
 39.
It is the method of choice for recovering encysted larva of T. spiralis.
o A.
Blood
o B.
Stool
o C.
Muscle biopsy
o D.
Urine
 40.
They are the natural host of C. philippinensis.
o A.
Brackish water fish
o B.
Humans
o C.
Migratory fish-eating birds
o D.
None of the above
 41.
These are the morphologic forms of Filariae.

o A.
Adult worms
o B.
Microfilariae
o C.
Ova
o D.
Both a and b
 42.
It is a transparent covering of filarial worms.
o A.
Sheath
o B.
Chitin
o C.
Albuminous layer
o D.
True Shell
 43.
Filariae doesn't have male and female forms.
o A.
True
o B.
False

 44.
The ideal time of nocturnal periodicity.
o A.
10 am - 2 pm
o B.
9 am - 4 pm
o C.
9 pm - 4 am
o D.
2 pm - 10 am
 45.
It is the ideal time of diurnal periodicity.
o A.
10 am - 2 pm
o B.
9 am - 4 pm
o C.
9 pm - 4 am
o D.
2 pm - 10 am
 46.
It is a method used to detect microfilariae.
o A.
Giemsa stain

o B.
Nucleopore filter
o C.
Biopsy
o D.
Knott technique
 47.
It is the mode of transmission of Wuchereria bancrofti and Brugia malayi.
o A.
Mosquito bite
o B.
Fly bite
 48.
Which of the following is the intermediate host of Loa loa?
o A.
Simulium
o B.
Chrysops fly
o C.
Black fly
o D.
Both a and c
 49.
Which of the following does not belong to the group? (W. bancrofti)

o A.
Anopheles
o B.
Mansonia
o C.
Culex
o D.
Aedes
 50.
Which of the following is the unique intermediate host of B. malayi?
o A.
Anopheles
o B.
Mansonia
o C.
Aedes
o D.
Culex
 51.
Which of the following is the intermediate host of Mansonella spp?
o A.
Anopheles
o B.
Aedes

o C.
Chrysops
o D.
Culicoides
 52.
It possesses a sheath wiith two distinct nuclei at the tip (tail).
o A.
Wuchereria bancrofti
o B.
Loa loa
o C.
Brugia malayi
o D.
Onchocerca volvulus
 53.
Sheathed with numerous nuclei on the body but free of nuclei at the posterior end.
o A.
Mansonella ozzardi
o B.
Brugia malayi
o C.
Onchocerca volvulus
o D.

 54.
Which of the following is sheathed with distinct abundance of nuclei from the head to
pointed tail?
o A.
o B.
Loa loa
o C.
Brugia malayi
o D.
Mansonella perstans
 55.
Which of the following filarial worms has a distinct presence of nuclei but does not
extend to the tail and do not possesses a sheath?
o A.
Onchocerca volvulus
o B.
Loa loa
o C.
Brugia malayi
o D.
 56.
Which of the following is associated with Calabar swelling?
o A.

Loa loa
o B.
Mansonella perstans
o C.
Brugia malayi
o D.
Both a and b
 57.
Which of the following is associated with elephantiasis?
o A.
o B.
Brugia malayi
o C.
All of the above
o D.
None of the above
 58.
It is the specimen of choice for the identification of Onchocerca volvulus.
o A.
Muscle biopsy
o B.
Blood
o C.

Skin snips
o D.
Stool
 59.
It is the causative agent of River Blindness.
o A.
Brugia malayi
o B.
Loa loa
o C.
Onchocerca volvulus
o D.
Manzonella perstans
 60.
It is the causative agent of urticaria, lymphadenitis and arthialgias.
o A.
Mansonella perstans
o B.
Onchocerca volvulus
o C.
Loa loa
o D.
Mansonella ozzardi
 61.

Match the following Filarial Worms with their common name.
o A. Wuchereria bancrofti
o A.
Select a Match
o B. Brugia malayi
o B.
Select a Match
o C. Loa loa
o C.
Select a Match
o D. Onchocerca volvulus
o D.
Select a Match
o E. Mansonella ozzardi
o E.
Select a Match
o F. Mansonella perstans
o F.
Select a Match
 62.
Match the following nematodes with their corresponding OVA measurements. (From
Zeibig)
o A. Strongyloides stercoralis
o A.
Select a Match
o B. Ancylostoma duodenale
o B.
Select a Match
o C. Necator americanus
o C.
Select a Match
o D. Ascaris lumbricoides
o D.
Select a Match
o E. Enterobius vermicularis
o E.
Select a Match
o F. Trichuris trichiura
o F.
Select a Match
 63.
Match the following nematodes with their corresponding adult or larval measurements.
(From Zeibig)
o A. Enterobius vermicualris female
o A.
Select a Match
o B. Enterobius vermicualris male
o B.
Select a Match
o C. Hookworm Rhabditiform (Newlyhatched)
o C.
Select a Match
o D. Hookworm Female

o D.
Select a Match
o E. Trichuris trichiura
o E.
Select a Match
o F. Ascaris lumbricoides female
o F.
Select a Match
o G. Ascaris lumbricoides male
o G.
Select a Match
o H. Hookworm Rhabditiform (5 days old)
o H.
Select a Match
o I. Hookworm male
o I.
Select a Match
o J. Strongyloides stercoralis Rhabditiform
o J.
Select a Match
o K. Strongyloides stercoralis Filariform
o K.
Select a Match
o L. Strongyloides stercoralis female
o L.
Select a Match
o M. Trichinella spiralis encysted larva
o M.
Select a Match
o N. Trichinella spiralis female
o N.
Select a Match
o O. Trichinella spiralis male
o O.
Select a Match
o P. Dracunculus medinensis First-Stage Larva
o P.
Select a Match
o Q. Dracunculus medinensis Female
o Q.
Select a Match
o R. Dracunculus medinensis male
o R.
Select a Match
 64.
Match the following microfilariae with their measurements. (From Zeibig)
o A. Onchocerca volvulus
o A.
Select a Match
o B. Brugia malayi
o B.
Select a Match
o C. Loa loa
o C.
Select a Match
o D. Mansonella perstans
o D.
Select a Match
o E. Wuchereria bancrofti

o E.
Select a Match
o F. Mansonella ozzardi
o F.
Select a Match
 65.
Identify the nematode.
o A.
o B.
o C.
o D.
Trichuris trichiura
 66.
o A.
Whipworm
o B.
Threadworm
o C.
Pinworm
o D.
 67.
Identify the parasite.

o A.
o B.
o C.
o D.
Trichuris trichiura
 68.
Determine the organism with this life cycle.
o A.
Hookworm
o B.
o C.
o D.
 69.
Determine the parasite involved in this life cycle.
o A.
o B.

o C.
o D.
Both a and b
 70.
Which of the following is a distinct characteristic of this nematode?
o A.
D shape
o B.
Peanut shape
o C.
Prominent hyaline polar plug
o D.
Both b and c
 71.
o A.
Trichinella trichiura
o B.
Ascaris lumbricoides ova
o C.
Enterobius vermicularis ova
o D.

 72.
Identify which of the following is a correct description of the picture.
o A.
Onchocerca volvulus : Black fly
o B.
Loa loa : Simulium
o C.
Loa loa : Chrysops fly
o D.
Onchocerca : Mansonia
 73.
Identify the filariae and the intermediate vector.
o A.
Brugia malayi : Aedes, Anopheles, Mansonia
o B.
Wuchereria bancrofti : Aedes, Anopheles, Culex
o C.
Loa loa : chrysops fly
o D.
Onchocerca volvulus : Simulium
 74.
Identify the filaria.
o A.
Mansonella perstans

o B.
Mansonella ozzardi
o C.
All of the above
o D.
None of the above
 75.
Identify the nematode involved.
o A.
o B.
Trichuris trichiura
o C.
o D.

Parasitology questions and answers

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