Flashcards in Sheep neuro dz Deck (31)
What are the signs of listeria?
Head tilt, drooping of ear, eyelid, packing feed in cheek, circling. Can cause abortion
How do you avoid listeria?
avoid poor quality silage (rarely hay)
How is listeria treated?
long acting oxytet (extralabel) seems to work well if catch animals early
What causes polio?
What are the signs of polio
What is the treatment for polio
thiamine. If treat early they get better quickly. if delay treatment then not as good recovery
Do sheep get lead poisoning?
What is a key feature of polio?
they have no menace response--are cortically blind but the pupil responds to light
What is swayback?
congenital copper deficiency. hind limb ataxia due to poormyelination in spine
What is swayback difficult to distinguish from?
white muscle disease
How is swayback treated?
it cannot be treated. they are euthanized
Why does white muscle disease ressemble swayback/
because their hind leg muscles get painful and they do weird things with them
How do you dx swayback
What is Gid?
taenia multiceps (coenurus cerebralis) tapeworm that is in dog intestine, it encysts in the brain. The signs ressemble listeria. not really seen here. Surprising few signs--no facial paralysis, but does circle.
How is Gid treated?
cannot treat with dewormer because they don't enter the brain. The treatment is BRAIN SURGERY. When the cyst is big enough, if palpate the skull can feel a soft spot. anesthetic/sedate--cut, scrape down, grab cyst with forceps, drain, pull the cyst out. Suture up. High success rate. Not seen here, seen in developing countries
What is the preventative strategy of Gid?
deworm the dogs
What do you diagnose scrapie based on?
CLINICAL SIGNS not the dx
What are the clinical signs of scrapie
1. very pruritic-not all cases
2. subtle behavioral changes
3. problems walking--skip/jump/stilted gait--eventually become recumbent
How is scrapie transmitted?
horizontally (and vertical?)
Is there a test for scrapie
Is scrapie zoonotic?
What is often a lot of the reason that a sheep loses weight with scrapie?
they are so itchy that they don't eat
How can you test how pruritic a sheep is?
sratch them, see how much they like it--nibbling, rub up against you
Where is the infectious agent for scrapie present?
in placenta and birth fluids
How can a ewe be exposed to scrapie?
licking other sheep's placenta--difficult to control
(also via mother)
How do you test for scrapie?
1. can find in lymphatic tissue under the third eyelid
2. rectal mucosa (lymphatic tissue)--IHC
3. PM evaluation of brain
What is the goal for eradication of scrapie from sheep?
export breeding stock
What are the parts of eradication?
2. surveillance and targeted culling
3. voluntary eradication program
Is there differences in genetic susceptibility to scrapie?
yes. it is not breed related but breeds may have different prevalence of different genetics. The amino acids at certain spots on the PrP gene determines susceptibility