Flashcards in Quiz 7 Deck (64):
Who is the host for Strongylus vulgaris
What does the worm Strongylus vulgaris look like?
Bard red with a large buccal capsule
What is the agent of Acute Verminous Arteritis?
Life cycle of S vulgaris
Eggs passed in feces
L1-L3 in environment
Horse ingests L3
L3 penetrates mucosa of cecum/colon
L3-L4 in cecum/colon
L4 migrates through the mesenteric arteries
Molt to Immature adults-migrate to intestinal wall to develop into the adult
What causes aneurysms, thromboembolisms, intestinal infarctions?
Acute Verminous Arteritis
How can you diagnose S vulgaris?
What CS will you see with a S vulgaris infection?
acute colic and diarrhea
What is the primary parasitic pathogen of horses?
What do you need to remember about the weather and Cyanthostomes
Resistant to colder weather
Life cycle of Cyanthostomes
Eggs in feces
L3 ingested and penetrate colonic and cecal mucosa
L3 to L4 and encysts (hypobiosis)
L4 remerges in the spring to the surface of the mucosa and molts into adults
What CS are you gonna see with larval cyanthostomiasis?
When you have thousands of L4 remerging at the same time what CS will you see for cyanthostomiasis?
How can you diagnose Cyanthostomes?
Larvae seen on a rectal palpation sleeve
CS and PCR
NO FECAL FLOAT
Why can you not see eggs on a fecal float when you see CS?
The CS occur onces the L4 have re-emerged. There are no eggs at this life stage
What parasite is common in the adult pig?
Where is the oesophagostomum found in the body?
Lumen and SI
What parasite causes thin sow syndrome?
Life Cycle of oesophagostomum
unebryonated eggs in feces
L1-L3 in enivronment
L3 ingested and encysts in/on intestinal wall
develop to L4
L4 re-emerges in 2wks-2mo and develops to adult
CS of Oesophagostomum
Nodules caseate and calcify
Dx of oesophagostomum
CS or post mortum
What parasite is found in cysts in the perirenal fat and the pelvis of the kidney in swine?
What do the worms of S dentatus look like?
What kind of pig does S dentatus infect?
older pigs that are housed outdoors
Is S dentatus sensitive to the cold?
YES, free living larvae are killed by cold temps
Life Cycle of S dentatus
Eggs passed in URINE
Larvae in environment for several months
Larvae ingested by pigs OR penetrate skin of PH (earthworm)--L3
Larvae migrate from intestine to liver to retroperitoneal tissue surrounding kidney
Eggs in 9-16 months and can persist for 3 yrs
Transplacental transmission also possible
What is the primary pathology of s dentatus?
liver damage from migration.
What is a common CS of S dentatus
Failure to thrive
What other CS can be caused by S dentatus?
Paralysis--migration to spinal cord
What is the scientific name for the grape worm?
Who is the DH for Syngamus trachea?
Who is the PH for Syngamus trachea?
what do birds eat?
Life Cycle of Syngamus trachea
ingestion of egg for earthworm containing L3
How do the adult Syngamus trachea look?
copula forming a Y shape
CS of Syngamus trachea
Dyspnea, suffocation, gaping mouth, extended neck
Dx of Syngamus trachea?
eggs with bipolar plugs in FF
What adult parasites are thin, reddish brown worms?
Who are the DH for ostertagia?
What is the other name for this
Western Stomach worm
LC of Ostertagia
Eggs in feces
Larvae to L3 on ground
DH ingests L3
Penetrate the gastric glands and molts in L4
Immature adults emerge onto mucosal surface and mature
What are the 2 types of Ostertagia?
Weanling calves in first grazing session
Diarrhea and weight loss
Lots of eggs and adult worms in feces
Rapid emergence of hypobiotic larvae in yearling calves
Few eggs/adults in feces
High mortality, anemia, hypoproteinemia, emaciation, bottle jaw
What is the scientific name for the barber pole worm? Why is it called this?
Females look like barber poles-their uterus/ovaries wind around blood filled gut
DH of Haemonchus
Sheep and cattle
LC of Haemonchus
Penetrate gastic epithelium of abomasum--L4--immature adult--re-emerge, mature to adult
Hypobiosis-"overwinter" and re-emerge in favorable conditions
Will you see eggs during the hypobiosis phase?
Why will you see a periparturient rise in haemonchus?
Ewes at lambing-rapid pasture contamination
When will you see anemia with haemonchus?
Acute with 10,000 worms
What form is the most common form of Haemonchus?
Chronic-little or no anemia
How do you Dx haemonchus?
What does Refugia mean?
Proportion of worm population that is not selected by drug treatment bc of selective tx rather than treating the whole herd
Why do we think this selective tx works for resistance?
Resistant worms from treated population will be diluted by non-resistant worms from untreated populations
Cattle and sheep
LC of Nematodirus
Direct-L3 infective stage
CS of Nematodiurs
Acute Diarrhea in young, could be fatal
Dx of Nematodirus
LARGE eggs on FF or adult worms at necropsy
Cattle, sheep, goats
same as other L3 infective
Adults are in SI
CS fo Cooperia
Diarrhea, anorexia, depressed growth
Dx of Cooperia
Eggs in FF or adults at necropsy
Trichostrongylus axei DH?
Cattle sheep goats-maybe horses
CS fo Trichostrongylus axei
Gastroenteritis in young
You are on a farm and multiple spp of animals are sick, what parasit could this be?
they can cross infect
LC fo Hyostrongylus
Direct, no migration
Larvae molt in the gastric mucosa in nodules
CS of hyostrongylus
Anemia, poor appetite, melena
Nodules in gastric mucosa