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WorksheetsVA3404 - Parasitology F
Total questions: 74
Worksheet time: 55mins
Parasites that live within the body are known as:
endoparasites.
ectoparasites.
exoparasites.
gastrointestinal parasites.
Which of the following may be seen in urine sediment?
Capillaria plica
Cystoisospora
Toxoplasma
Giardia
Roundworms are of the phylum:
Platyhelminthes.
Nematoda.
Acanthocephala.
Arthropoda.
How many intermediate hosts does Dipylidium canium have?
One
Two
Three
None
Ascending tick paralysis is known to be caused by:
Argasidae.
Ixodidae.
Biting midges.
Malliphaga
A patient that presents with intense pruritus and hair loss may have a parasitic infection caused by:
S. scabiei.
O. cynotis.
Demodex spp.
Cheyletiella.
To confirm the diagnosis of ringworm (dermatophytosis), which type of specimen should you collect and submit to the diagnostic laboratory?
Feces
Stomach contents
Blood sample
Skin scrapings
Fungi can be differentiated based on the structure of their hyphae and the presence of:
mycelia
spores
chitin
capsules
Pathogenic bacteria exhibit ____ hemolysis on blood agar.
alpha
beta
gamma
no
The culture media most often used for growth of fungi and yeasts is:
Sabouraud dextrose
eosin-methylene blue
trypticase soy agar
McFarlane
A bacterial culture used for endospore staining should be approximately ___ hours old.
48
24
12
8
A useful stain in evaluation of fungal organisms is:
endospore stain
lactophenol cotton blue
Gram stain
Ziehl Nelson stain
Culture and sensitivity tests are evaluated by measuring the:
number of colonies produced
size of colonies produced
concentration of antimicrobials used
zone of inhibition
Which concentrated solution is used for recovering undistorted oocysts and nematode larvae from fecal samples?
Sodium chloride
Zinc sulfate
Sodium nitrate
All of the above
The parasites whose life cycle involves a mollusk are:
protozoa
nematodes
trematodes
cestodes
The infective stage of which parasite is an egg containing a larva, a free-living larva, or a larva within an intermediate host or transport host?
Protozoa
Nematodes
Trematodes
Cestodes
To which group of parasites does Dirofilaria immitis belong?
Protazoa
Neatodes
Trematodes
Cestodes
The infective stage of which parasite is the proglottid, which contains eggs with hexacanth embryos?
Protazoa
Nenatodes
Trematodes
Cestodes
Which method is usually best for identifying fluke eggs?
Direct Smear
Flotation
Sedimentation
Baermann technique
Diagnosing Otodectes cynotis infection is a simple matter of:
examining a thin-film blood smear at 40× magnification
combing the animal over black paper and watching for “moving dandruff”
swabbing the external ear canal and examining the wax microscopically in mineral oil
making an impression smear of the underside of a scab
Eggs from the Trichuris sp. are distinguished by:
the presence of symmetric bipolar plugs
the presence of an operculum
the characteristic hexacanth embryo contained in the egg
their thick, dark, irregular shell
Fleas can act as intermediate hosts for:
Ctenocephalides canis
Dipylidium caninum
Ancylostoma sp.
Demodex canis
At low magnification, which feature most differentiates sucking from biting lice?
Body size
Body shape
Shape of the head and mouthparts
Color
Cuterebra sp. (botflies) are:
nematodes
cestodes
trematodes
insects
The burrowing mite that is considered normal skin fauna in most mammals is:
Sarcoptes scabiei
Demodex spp.
Psoroptes spp.
Cheyletiella spp.
Which mite is also known as “walking dandruff”?
Sarcoptes scabiei
Demodex spp.
Psoroptes spp.
Cheyletiella spp.
The burrowing mite that does not cause pruritus, even with heavy infestation, is:
Sarcoptes scabiei
Demodex spp.
Psoroptes spp.
Cheyletiella spp.
Infection of a human with the common canine roundworm (Toxocara canis) causes a condition known as:
cutaneous larva migrans
visceral larva migrans
ringworm
toxoplasmosis
Trematodes and cestodes are similar because they:
are dorsoventrally flattened and have muscular suckers for attachment
lack a digestive tract
have direct life cycles
have separate sexes
Samples collected for parasitologic examinations should be:
examined grossly for consistency, color, odor, blood, mucus, and foreign bodies
examined 48 hours after collection
collected off the ground to include grass and soil from the environment
conducted using a direct smear only
An organism that harbors the immature stage of a parasite is referred to as:
definitive host
intermediate host
paratenic host
symbiotic host
An organism that harbors the adult stage of a parasite is referred to as:
definitive host
intermediate host
paratenic host
symbiotic host
An organism that serves to transport a parasite is referred to as a:
definitive host
intermediate host
paratenic host
symbiotic host
Infection of a human with the common canine hookworm (Ancylostoma caninum) causes a condition known as:
cutaneous larva migrans
visceral larva migrans
ringworm
toxoplasmosis
Infection of a human with the larvae of Thelazia spp. causes a condition known as:
cutaneous larva migrans
visceral larva migrans
hydatidosis
verminous conjunctivitis
The Baermann technique is used to diagnose infection with:
Stephanofilaria stilesi
Trichinella spiralis
Strongyloides
Oxyuris equi
Fresh plucked hair and skin scrapings from the edges of lesions are needed in diagnosing which of the following?
M. canis
Cryptococcus neoformans
Histoplasma capsulatum
Sporothrix schenckii
Cellophane tape preparation is used to diagnose infection with:
fleas
mites
hookworm
tapeworm
The causative agent of Rocky Mountain Spotted Fever is:
Neorickettsia
Rickettsia
Anaplasma
Trichuris
Spirocerca lupi is commonly referred to as the ___worm of dogs.
esophageal
stomach
lung
bladder
Capillaria plica is commonly referred to as the ___worm of dogs.
esophageal
stomach
lung
bladder
Physaloptera sp. is commonly referred to as the ___worm of dogs.
esophageal
stomach
lung
bladder
Infestation with lice is referred to as:
myiasis
sparganosis
pediculosis
cysticercosis
Infestation with larval flies (maggots) is referred to as:
myiasis
sparganosis
pediculosis
cysticercosis
The life cycle stage of lice bound to the hair or feather shaft of the host is referred to as:
proglottid
nit
redia
cysticercus
Larval _____ species are usually found in swollen, cystlike subcutaneous sites, with a fistula communicating to the outside environment.
Onchocerca
Cuterebra
Thelazia
Sarcocystis
List and define the 3 means of reproduction in the protozoa.
(a)
Define Trophozite:
(a)
What benefit to the parasite does the cyst stage provide?
(a)
Define Oocyst:
(a)
Define Prepatent Period:
(a)
What is the difference between Temporary and Permanent Parasite?
List 2 different types of Hosts? Explain
List 4 requirements for parasites to survive.
(a)
What is the difference between indirect or direct life cycle?
What are the three regions of the tapeworm?
(a)
Which of the above listed features in question 57 contain hooks?
(a)
Cestodes lack a digestive system
True
False
Cestodes absorb nutrients through the body wall
True
False
male and female organs are present in each tapeworm
True
False
Cestode eggs have a fully developed embryo
True
False
The Tapeworm life cycle is direct and involves 2 intermediate hosts
True
False
Trematodes have a sucker at the mouth and ventrally near the middle of the body
True
False
Fluke worms have both sex organs in the same individual
True
False
The roundworm’s reproductive organs coil around the intestinal tract
True
False
Name 4 means of transmission that is evident with larval parasites
(a)
Circle the Nematodes of Dogs and Cats
Toxocara spp.
Toxascaris spp.
Ancylostoma spp.
Trichuris vulpis spp.
Heartworm
Dirofilaria caninum live in
he lungs
the right ventricle
the pulmonary artery
B & C
Female heartworm release _______ into the bloodstream and are ingested by _____________.
Microfilaria; mosquitoes
Oocysts; fleas
Larva; ticks
Nymphs; mites
Rickettsia Parasites are:
intracellular, gram negative bacteria that replicate in cytoplasma of eukaryotic cells
intracellular, gram positive bacteria that replicate in cytoplasma of eukaryotic cells
extracellular gram negative bacteria that replicate in the extracellular spaces
extracellular gram positive bacteria that replicate in blood vessels
What clues would a veterinarian find indicating a flea infestation on a dog?
(a)
What are the two different types of lice? List their characteristics.
What parasite flues nits to the fur of its host? Why is this host is considered species specific?
What is the difference between an oocyst and an egg?
(a)
