SMALL ANIMAL PARASITE REVIEW

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SMALL ANIMAL PARASITE REVIEW
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This egg was recovered from a feline fecal
flotation. I.D. to genus and species.
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Toxocara cati
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This worm was recovered from the small intestines
of a puppy that died of severe anemia. Identify
to genus and species.
Ant. End male post. end
Enface view
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Ancylostoma caninum
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This parasite was found in a rats liver that
you were necropsying. 1. What is it?
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Strobilocercus (cysticercus, bladder worm).
Larval stage of Taenia taeniaformis, a
cyclophyllidean tapeworm
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This parasite was recovered from a routine fecal
flotation of a fecal sample taken from an
8-month-old cat during a routine health
maintenance exam. This egg measures 60
microns. Identify to genus.
What major group of parasites does it represent?
(Be specific)
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• Spirometra
• 2. Cestodes / pseudophyllidean

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These parasites were recovered in a ZNSO4
Flotation (sp gr 1.18) in feces of a puppy. The
pups are housed in a kennel. The owner says some
of the puppies have been having intermittent,
mucoid, blood-flecked diarrhea. Identify to
genus What stage is present on left? What stage
is present on right?
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Giardia canis Left trophozoite Right cyst
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These worms were recovered from the small
intestine of a 3 month-old puppy at
necropsy. Identify to genus and species
In situ
Anterior end
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Toxocara canis
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Identify this parasites found in a fecal
flotation of a cat experiencing CNS symptoms.
The ova/oocyst measures 10 12 microns. The
stool was recovered from the cats litterbox and
may thus not be fresh.
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Toxoplasma gondii
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What is the best flotation media to recover
Toxoplasma oocysts from a fecal? a. NaNO3
b. Regular
sugar (sp gr 1.21) c. Sheathers Sugar(sp gr
1.31) d. ZnSO4 (spg 1.18)
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Sheathers Sugar. ( spin down method, remove
coverslip put on a slide and allow to sit for an
additional 10 minutes)
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Identify this worm recovered from the small
intestines of a cat at necropsy. Identify to
genus.
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Taenia spp
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This egg was recovered in a Formalin/Ethyl
acetate sedimentation of feces from a 13-yr-old
debilitated cat presented to you for treatment.
The egg measures 27 30 microns. Identify to
genus
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Amphimerus
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This egg was recoverd from a fecal exam of a
6-month-old dog with mucoid diarrhea. Identify to
genus. (the egg measures 70 89 microns)
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Trichuris vulpis
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This larvae was found in a fresh fecal sample
taking from a cat presented to you with watery,
projectile, voluminous diarrhea. Identify to
genus. What stage is this ?
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Strongyloides spp
1st stage larva
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This was found in the liver of a pig at necropsy.
What is it?
What genus does it represent?
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Hydatid cyst
Echinococcus spp
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These parasites were found in a fecal flotation
of a sample taken from a 3-week-old puppy
acquired from a local pet shop. Identify to
genus and species.
Measure 30 microns
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Isospora canis
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The egg, worm, and larval stage seen here is
representative of which parasite? It was found in
the small intestines of a dog at necropsy.
Identify to genus.
egg
Ant. end
Larval stage
segment
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Dipylidium caninum
What type of intermediate host would you find
the larval stage?
What is this larval stage?
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Invertebrate host is Ctenocephalides spp
Cysticercoid
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This tapeworm was recovered from the small
intestines of a cat at necropsy.
Identify to genus.
proglottids
bothria
Proglottids (close-up)
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Spirometra mansonoides
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Worms like these were found attached to the
stomach mucosa of a cat at necropsy. Id
entify to genus. What superfamily
does this worm represent?
Anterior end
Male posterior end
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Physaloptera spp spiruroidea
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Identify these worms found fecal washes of the
small intestines of a dog at necropsy.
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Echinococcus spp.
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Both of these eggs were recovered from a fecal
flotation of puppy. Which egg, when larvated,
can cause ocular larval migrans? Whic
h egg when it becomes a 3rd stage
larvae could cause cutaneous larval
migrans.
Identify each egg to genus.
80 90 microns
56 65 microns
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Toxocara canis (egg on left) ocular larval
migrans Ancylostoma braziliense (egg on
right) Cutaneous larval migrans (cannot
differentiate from A. caninum on the basis of
size Uncinaria is 10u larger)
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What parasite caused the wart-like lesions seen
here at the tracheal bifurcation of a dog?
Is the 1st stage larva shown here consistent with
the diagnostic stage passed in the feces of the
above parasite?
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Filaroides spp. YES
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This egg was recovered from the fecal of a cat
presented to you with coughing
episodes? Identify to genus.
90 120 microns
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Paragonimus kellicotti
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Which 1st stage larva, passed in a fecal sample
from a cat is consistent with that of
Aelurostrongylus ( cat lungworm) ?
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Larva on right is consistent with
Aelurostrongylus spp.
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These worms were recovered from the cecum of dog
at necropsy. Identify to genus.
esophagus
adults
Stained adult
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Trichuris vulpis
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What is a Knotts test?
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This test recovers microfilaria from whole blood.
It kills and straightens microfilaria and lyses
the RBCs, therefore making it easier to
differentiate Dirofilaria vs. Dipetalonema
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What do Canine Occult HW tests detect?
What additional tests would be useful for
suspected feline heartworms?
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K-9 Uterine antigen of female Dirofilaria
immitis
Feline Antibody to Dirofilaria immitis
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Identify this ova found in a dog presented to you
with respiratory problems.
59 - - 60 microns
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Capillaria aerophilia
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These organisms were found in a blood smear of a
dog presented to you with severe anemia.
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Babesia canis
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Identify this worm found in the small intestines
of a dog at necropsy. Identify to genus.
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Uncinaria spp.