Parasitology Exam 2 - Parasites

Question 1

haemonchus contortus
host
location
clinical signs

Answer 1

“barber pole worm” HOT COMPLEX
ruminants
abomasum
anemia, pale, bottle jaw, weight loss, death

Question 2

ostertagia ostertagia
host
location
pathogenesis

Answer 2

“brown stomach worm” HOT COMPLEX
sheep/cattle
abomasum
molts in gastric glands and larvae undergo hypobiosis

Question 3

trichostrongyles spp.
host
location

Answer 3

HOT COMPLEX
small ruminants, rodents, horses, pigs, birds
small intestine

Question 4

cooperia sp. associated with

Answer 4

HOT COMPLEX
resistance to anthelmintics in ruminants

Question 5

Oesophagostomum spp.
host
location
clinical signs

Answer 5

“nodular worms of livestock” HOT COMPLEX
ruminants
large intestine
nodules in walls of SI/LI

Question 6

Dicytocaulus viviparous
host
location
life cycle specifics

Answer 6

“cattle lung worm”
cattle
bronchial tree
vermiform embryo

Question 7

Muellerius capillaris
host
location
morphology
life-cycle (intermediate host)
diagnostics

Answer 7

“sheep lungworm”
sheep
lungs
posterior dorsal spine larvae
snail/slugs, L1 larvae coughed up and swallowed, L3 ingested
baermann

Question 8

Strongyloides
host
location
life cycle
transmission
diagnostics
zoonotic effect

Answer 8

ruminants - pass larvated eggs
GI tract
L1 “rhabitiform larvae”, L3 “filariform”
homogonic (female to L3), heterogonic (female free living)
ingestion of L3 larvated eggs
sheep –> percutaneous
cattle –> transmammary
fecal float for larvated eggs
CLM

Question 9

small strongyles
host
location
life-cycle
transmission

Answer 9

equine
GI tract
do not migrate extra-intestinally
ingestion of L3

Question 10

strongylus vulgaris
host
location
life cycle

Answer 10

equine
GI tract
migrates to cranial mesenteric a.

Question 11

strongylus edentatus
host
location
life cycle

Answer 11

equine
GI tract
migrates to liver via heptaic portal system then to subperitoneal space

Question 12

strongylus equinis
host
location

Answer 12

equine
GI tract

Question 13

Parascaris equorum
host
location
life cycle
transmission

Answer 13

“round worm” - largest nematode 40cm
equine
small intestine
hepatic pulmonary migration
ingestion of L3 infected egg

Question 14

Oxyuris equi
host
location
life cycle
transmission
clinical signs
diagnostics

Answer 14

“pinworm”
equine
cecum, colon, rectum
cement eggs in perianal region
ingestion of L3 infective eggs
pruritis, rubbing, rat-tail
scotch tape technique

Question 15

monziezia spp.
host
location
morphology
life cycle

Answer 15

hooved animals
small intestine
triangular and square eggs
cysticercoid (metacestode stage) & oribatid mite (int host)

Question 16

anoplocephala perfoliata
host
location
morphology
life cycle
clinical signs

Answer 16

equine
terminal ileum, cecum
pyriform apparatus, lappets, small round scolex, 4 suckers
oribatid mite (int host)
ulceration, obstruction, perforation

Question 17

fasciola hepatica
host
location
life cycle
diagnostics
zoonotic affect

Answer 17

“common liver fluke”, digean, monoecious
herbivores
liver/bile duct
miracidium, cercariae, metacercariae; Lymnae snail (int host)
sedimentation (test of choice)
humans

Question 18

cryptosporidium parvum & cryptosporidium hominis
host
location
life cycle
diagnostics
zoonotic affect

Answer 18

parvum (humans mammals) & hominis (humans)
GI tract
sporulated oocysts passed in feces
merogony/shizogony, gametogony, sporogony
acid fast
humans - chronic diarrhea

Question 19

Eimeria zurnii & Eimeria bovis
host
location
life cycle

Answer 19

“large animal coccidia”
many animals
GI tract
merogony/shizogony, gametogony, sporogony
unsporulated oocysts passed

Question 20

Eimeria Leuckarti
host
location
life cycle

Answer 20

equine
GI tract
merogony/shizogony, gametogony, sporogony
unsporulated oocysts passes

Question 21

Tritrichomonas foetus
host
location
life cycle
transmission
clinical signs
diagnostics

Answer 21

cattle/wild ruminants
urogenital tract
trophozoite stage only, no oocyst
venereal
reproductive issues - abortion
In Pouch System

Question 22

hypoderma lineatum & hyoderma bovis
host
location
clinical signs

Answer 22

“northern cattle grub” & “common cattle grub”
cattle
esophageal tissue; spinal cord
fatal, severe rxn

Question 23

chorioptes spp.
host

Answer 23

mite
dairy cattle

Question 24

oestrus ovis
host
location
life cycle
zoonotic

Answer 24

“nasal bot”
sheep
nostrils, frontal sinus
squirt jet of liquid in flight
animals panic, stomp feet, cluster
zoonotic - humans

Question 25

Melophagus ovinus
host
location

Answer 25

“sheep ked”
sheep
wool

Question 26

Psoroptes sp.
host
life cycle
clinical sign
diagnostics

Answer 26

mite
sheep
predilection to ears, then head/neck
psoroptes mange
superficial skin scraping

Question 27

gasterophilus intestinalis
host
morphology
location

Answer 27

equine stomach bots
equine
reddish/orange with posterior spiracles, 16-20mm
margo plicatus, eggs laid on forelimbs

Question 28

gasterophilus nasalis

Answer 28

eggs laid on nose

Question 29

gasterophilus hemorrhoidalis

Answer 29

eggs laid on lips/mouth

Question 30

cheyletiella sp.
host
location
morphology
clinical signs

Answer 30

mite
small animals
dorsum
claws, boxy, non-burrowing
red/yellow crusts, dermatitis, dandruff

Question 31

sarcoptes scabiei
host
location
morphology
clinical signs

Answer 31

mite
dogs, wild canids
ears, elbow, hock, flanks, ventrum
no claws, round, burrowing
hyperkeratosis, alopecia, pruritus

Question 32

demodex spp. (D. canis, D.injair)
host
location
morphology
clinical signs
diagnostics

Answer 32

small animals
normal fauna, overgrowth, hair follicles, sebaceous gland ducts
long, elongated, cigar-like
localized and generalized
deep skin scrapes, require blood