Parasite Identification

Ancylostoma caninum

Who do these eggs belong to?
(canine)
thin shelled and in morula stage
average 60x40 micrometers

hookworm

Small intestine from a canine with acute ______ disease

Ancylostoma caninum

small worms
(canine)
males 10-12mm
females 14-16 mm
3 pairs of large teeth in buccal capsule
males w/ copulatory bursa

Uncinaria stenocephala

adult worms
(dog, cat, fox)
male 5-8.5mm
female 7-12mm
cutting plates rather than teeth

Uncinaria stenocephala

eggs are larger on exam
(dog, cat, fox)
70-90 x 40-50 um

cutaneous larval migrans of hookworms

What is this a picture of?

visceral larval migrans of hookworms

What is this a picture of?

Toxocara canis

mouth with 3 lips rather than large (open) buccal capsule
(canine)

Toxocara canis

Who do these eggs belong to?

round, pitted shell with "sticky" albuminous coat
dark, single cell embryo
75-90 micrometer (about 85 micrometer diamter average)

Toxocara canis

What type of adult worm is this?

(visible cervical alae)
large stout worms
around 7-18cm
females are always larger
males have coiled tail

Toxocara cati

What type of adult worm is this?

(prominant cervical alae)

Toxocara cati

Who do these eggs belong to?

round, pitted shell with "sticky" albuminous coat
dark, single cell embryo
60-70 micrometers
65 micrometer diameter

Toxascaris leonia

What type of adult worm is this?

dog/cat roundworm
similar in size to T. canis and T. cati
alae similar to T. canis (linear, narrow)

Toxascaris leonia

Who do these eggs belong to?

round to slightly oval
smooth shell and lacking albuminous coat seen in Toxocara
light, translucent single cell embryo
85-90 micrometer (avg 85 micrometer diameter

Baylisascaris procyonis

What type of adult worm is this?

Raccoon roundworm
males 9-11 cm
females 20-22cm
cervical alae inconspicuous (vestigal)
worms are much larger than T. canis or T. cati but eggs are smaller

Baylisascaris procyonis

Who do these eggs belong to?

sub spherical to round to slightly oval
thick albuminous shell
finely fitted pitted surface
63-88 micrometers by 50-70 micrometers
(avg is 85 micrometers)
dark brown embryo

ocular larval migrans of Toxocariasis

What is this a picture of?

Zoonotic Baylisascariasis

What is this a picture of (aside from a cross section)?

Stronglyoides stercoralis

What type of adult worm is this?

small threadlike worm in small intestine
females: about 2.2 mm long
1st stage larvae: about 380 micrometers

Stronglyoides stercoralis

Who do these eggs belong to?

larvated eggs: about 50-35 micrometers
thin shelled and larvated

Ollulanus tricuspis

What type of adult worm is this?

small minute worms
<1mm
will only be seen in vomit

Ollulanus tricuspis

What type of adult worm is this?

small minute worms
<1mm
will only be seen in vomit of cats

Physaloptera sp.

What type of adult worm is this?

stout pinkish worm
13-48mm in length
2 lips and cuticular ring around anterior end

Physaloptera sp.

Who do these eggs belong to?

thick shelled
larvated eggs about
50 micrometer diameter

Spirocerca lupi

What type of adult worm is this?

coiled pinkish worms
30-80 mm in length
2 lips

Spirocerca lupi

Who do these eggs belong to?

thick shelled
larvated eggs
30x12 micrometers
resemble paper clip

Trichuris vulpis

What adult worm is this?

small worm with whip life anterior ends
30-50mm
females are always larger
tiny buccal capsule with long esophagus (~2/3 body length)

Trichuris vulpis

Who do these eggs belong to?

large eggs with polar plugs
90-40 micrometers

Trichnella sp.

What adult worm is this?

males: 1.4-1.6 mm
females: 3-4mm
tiny buccal capsule
long esophagus (aprox. equal to rest of body)

Capillaria spp.

Who do these eggs belong to?

smaller ~ 65micrometer in length
polar plugs may be off-set
smooth to micropunctate, rugulate surface

Trichuris vulpis, Capillaria spp.

The egg in the top left is ___________
The egg in the bottom right is ____________

Large Strongyles

What adult worms are shown to the left in the dish and the two bottom pictures?
(equine)

Small Strongyles

What adult worms are shown to the right in the dish and the bottom picture?
(equine)

L4 small strongyles

What are these red worms?
(equine)

adult large strongyles

What are these clear, large worms in the intestine?
(equine)

large strongyles and cyanthostomins

Who do these eggs belong to?
(horses, pigs)

Parascaris equorum

Who do these eggs belong to?
(equine)
- ~90 micrometers on fecal float

Parascaris equorum

What adult worm is this?
(equine)
- males 15-28 cm
- females up to 50 cm long and 8 mm in diameter

Oxyuris equi

What adult worm is this?
(equine)
- males 9-12 mm
- females 40-150mm

Oxyuris equi

Who do these eggs belong to?
(equine)
- oval/operculated egg
- 90x42 micrometers
(observed on "ScotchTape" slide)
- egg mass in tail (8 to 60K)

Strongyloides westeri

Who do these eggs belong to?
(equine)
- 50x35 micrometers (on fecal float)
- thin shelled-larvated eggs

Draschia and Habronema

Who do these eggs belong to?
(equine)
- ~45x~12 micrometers (occasionally seen on fecal float)

Trichostrongylid Nematodes

Who do these eggs belong to?
(cattle, sheep, goats, camelids)
- 70-90x40-45
(all species are morphologically indistinguishable)
- thin shelled

Nematodirus spp

Who do these eggs belong to?
(cattle)
- ~200x90 micrometers

Haemounchus contortus

What adult worm is this?
(small ruminants)
males 10-20 mm
females 18-30mm

Ascaris suum

What adult worm is this?
(swine)
male 15-25 cm
female up to 45 cm

Ascaris suum

Who do these eggs belong to?
(swine)
- 62x45 micrometers
- thick, mammilaed shell
- golden brown
- single cell (uninfected when passed in feces)
- sticky albuminous coat

Trichuris suis

What adult worms are these?
(swine)
males: 30 to 55mm
females: 35 to 50mm
stout body with whip-like esophagus

Trichuris suis

Who do these eggs belong to?
(swine)
- eggs ~55x25 micrometers
- elongate w/ distinct polar plugs
- golden brown
- single cell (uninfective) when passed in feces

Oesophagostomum dentatum

What adult worm is this?
(swine)
- males: 8-10mm
- females: 11-14mm

Oesophagostomum dentatum

Who do these eggs belong to?
(swine)
- 60-80 micrometers by 35-40 micrometers
- thin shelled morula
- uninfective when passed in feces

Stephanurus dentatus

What adult worm is this?
(swine)
- males: 20-30mm
- females: 30-45 mm

Stephanurus dentatus

Who do these eggs belong do?
(swine)
- 90-120 micrometers by 43-70 micrometers
- thin-shelled morula
- uninfective when passed in urine

Strongyloides ransomi

Who do these eggs belong to?
(swine)
- thin shelled
- larvated eggs
- 50x35 micrometers seen on fecal float

Heterakis

Who do these eggs belong to?
(poultry)
65-80 micrometers by 35-45 micrometers

Ascaridia

Who do these eggs belong to?
(poultry)
73-92 micrometers by 45-57 micrometers

Syngamus trachea

What are these adult worms?
(poultry)
- medium size

Syngamus sp

Who do these eggs belong to?
(poultry)
- thin shelled morula
- strongyle-type
- 70-90x45 micrometers

capillaria sp

Who do these eggs belong to?
(poultry)
- polar plugs
- 50-60x35-40 micrometers

Spiruid-type

Who do these eggs belong to?
(poultry)
- thick shell
- colorless
- larvated
- 35-50x25-35 micrometers

Filaroides spp

What larvae is this?
first stage in canine
- kinked tail
~350 micrometer

Aleurostrongylus abstrusus

What larvae is this?
first stage in feline
- kinked tail
~ 350 micrometer

Muellerius capillaris

What larvae is this?
domestic livestock
1st stage larvae
kinked tail

Dictyocaulus

Which domestic livestock parasite is on the left?

mullerius

Which domestic livestock parasite is on the right?

Metastrongylus elongatus

What egg is this?
40-50 um
thin shell
passed in feces
swine

Dirofilaria immitis

What microfilaria is this?
- head is tapered
- tail is straight
- >300um

Ancanthocheilonema reconditum

What microfilaria is this?
- 215-270um long
- blunt head
- hooked tail

Capillaria sp

Whose eggs?
in urinary tract of dogs and cats
~65x35 um

Dictophyma renale

What worm is this?
- females up to 100cm long
(dog and cat)

Dictophyma renale

Whose eggs?
- in urine
- 68x44um
(dogs and cats)

Thelazia sp

What worm is in the left eye?
- small hookworm-like body

Onchocerca lupi

What worm is in the right eye?
- long filamentous worms

Paraelaphostrongylus tenuis

What worm is this?
- deer brain encased in dura matter
- worm seen in the incised dorsal venous sinus