Parasitology Exam 2 - Parasites Flashcards
haemonchus contortus
host
location
clinical signs
“barber pole worm” HOT COMPLEX
ruminants
abomasum
anemia, pale, bottle jaw, weight loss, death
ostertagia ostertagia
host
location
pathogenesis
“brown stomach worm” HOT COMPLEX
sheep/cattle
abomasum
molts in gastric glands and larvae undergo hypobiosis
trichostrongyles spp.
host
location
HOT COMPLEX
small ruminants, rodents, horses, pigs, birds
small intestine
cooperia sp. associated with
HOT COMPLEX
resistance to anthelmintics in ruminants
Oesophagostomum spp.
host
location
clinical signs
“nodular worms of livestock” HOT COMPLEX
ruminants
large intestine
nodules in walls of SI/LI
Dicytocaulus viviparous
host
location
life cycle specifics
“cattle lung worm”
cattle
bronchial tree
vermiform embryo
Muellerius capillaris
host
location
morphology
life-cycle (intermediate host)
diagnostics
“sheep lungworm”
sheep
lungs
posterior dorsal spine larvae
snail/slugs, L1 larvae coughed up and swallowed, L3 ingested
baermann
Strongyloides
host
location
life cycle
transmission
diagnostics
zoonotic effect
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
small strongyles
host
location
life-cycle
transmission
equine
GI tract
do not migrate extra-intestinally
ingestion of L3
strongylus vulgaris
host
location
life cycle
equine
GI tract
migrates to cranial mesenteric a.
strongylus edentatus
host
location
life cycle
equine
GI tract
migrates to liver via heptaic portal system then to subperitoneal space
strongylus equinis
host
location
equine
GI tract
Parascaris equorum
host
location
life cycle
transmission
“round worm” - largest nematode 40cm
equine
small intestine
hepatic pulmonary migration
ingestion of L3 infected egg
Oxyuris equi
host
location
life cycle
transmission
clinical signs
diagnostics
“pinworm”
equine
cecum, colon, rectum
cement eggs in perianal region
ingestion of L3 infective eggs
pruritis, rubbing, rat-tail
scotch tape technique
monziezia spp.
host
location
morphology
life cycle
hooved animals
small intestine
triangular and square eggs
cysticercoid (metacestode stage) & oribatid mite (int host)
anoplocephala perfoliata
host
location
morphology
life cycle
clinical signs
equine
terminal ileum, cecum
pyriform apparatus, lappets, small round scolex, 4 suckers
oribatid mite (int host)
ulceration, obstruction, perforation
fasciola hepatica
host
location
life cycle
diagnostics
zoonotic affect
“common liver fluke”, digean, monoecious
herbivores
liver/bile duct
miracidium, cercariae, metacercariae; Lymnae snail (int host)
sedimentation (test of choice)
humans
cryptosporidium parvum & cryptosporidium hominis
host
location
life cycle
diagnostics
zoonotic affect
parvum (humans mammals) & hominis (humans)
GI tract
sporulated oocysts passed in feces
merogony/shizogony, gametogony, sporogony
acid fast
humans - chronic diarrhea
Eimeria zurnii & Eimeria bovis
host
location
life cycle
“large animal coccidia”
many animals
GI tract
merogony/shizogony, gametogony, sporogony
unsporulated oocysts passed
Eimeria Leuckarti
host
location
life cycle
equine
GI tract
merogony/shizogony, gametogony, sporogony
unsporulated oocysts passes
Tritrichomonas foetus
host
location
life cycle
transmission
clinical signs
diagnostics
cattle/wild ruminants
urogenital tract
trophozoite stage only, no oocyst
venereal
reproductive issues - abortion
In Pouch System
hypoderma lineatum & hyoderma bovis
host
location
clinical signs
“northern cattle grub” & “common cattle grub”
cattle
esophageal tissue; spinal cord
fatal, severe rxn
chorioptes spp.
host
mite
dairy cattle
oestrus ovis
host
location
life cycle
zoonotic
“nasal bot”
sheep
nostrils, frontal sinus
squirt jet of liquid in flight
animals panic, stomp feet, cluster
zoonotic - humans
Melophagus ovinus
host
location
“sheep ked”
sheep
wool
Psoroptes sp.
host
life cycle
clinical sign
diagnostics
mite
sheep
predilection to ears, then head/neck
psoroptes mange
superficial skin scraping
gasterophilus intestinalis
host
morphology
location
equine stomach bots
equine
reddish/orange with posterior spiracles, 16-20mm
margo plicatus, eggs laid on forelimbs
gasterophilus nasalis
eggs laid on nose
gasterophilus hemorrhoidalis
eggs laid on lips/mouth
cheyletiella sp.
host
location
morphology
clinical signs
mite
small animals
dorsum
claws, boxy, non-burrowing
red/yellow crusts, dermatitis, dandruff
sarcoptes scabiei
host
location
morphology
clinical signs
mite
dogs, wild canids
ears, elbow, hock, flanks, ventrum
no claws, round, burrowing
hyperkeratosis, alopecia, pruritus
demodex spp. (D. canis, D.injair)
host
location
morphology
clinical signs
diagnostics
small animals
normal fauna, overgrowth, hair follicles, sebaceous gland ducts
long, elongated, cigar-like
localized and generalized
deep skin scrapes, require blood
