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Flashcards in parasitology - large animal worms Deck (12):
1

Dictyocaulus arnfeldi
- seen in what animals
- DH
- dx

horse lungworm
- DH = donkeys seen in horses housed around donkeys
- dx = baermann

2

Dictyocaulus viviparous
- seen in what animals
- ingest what life stage? where does it go?
- dx
- tx

the horse lungworm
- ingest L3s: hatch in SI and migrate via lymphatics to lungs, molt to L4, are coughed and swallowed where they molt
- dx via baermann or trach wash
- tx = fenbendazole, ivermectin, leamisole, albendazole

3

Dictyocaulus filarial
- seen in what animals
- clinical signs

- goat lungworm
- bronchitis in goats

4

Cochliomyia hominivorax
- what type of worm
- how was it eradicated?
- CS
- what other flies may do this to wounds?

screw worms! (metallic blue-green fly)
- eradicated from the US by releasing lots of sterile males
- CS: myiasis - laying eggs on wounds, maggots feed on flesh creating a large wound
- Sarcophaga spp (flesh flies) will also do this

5

Oestrus ovis
affects what animal
- what happens?
- CS
- dx
tx

affects sheep!
- fly deposits larvae at nostrils and they migrate into nose to develop
- CS: sneezing, head shaking, nose rubbing, nasal discharge, stridor
- cytology of nasal discharge = eosinophils and mast cells
- tx = ivermectin

6

Hematopinus
what worm is it and what does it infect?
- CS in what age?
- how is it diagnosed?
- how many legs do they have?

blood sucking lice in cows!
- CS: severe anemia, in calvs 2 - 7 months old, susceptible to pneumonia
- dx via skin scraping: lice have SIX legs

7

neospora caninum
- what does it cause in what animal and at what age?
- DH
- what is common presentation?
- what is unique about this clinical sign?
- what lesion do you usually see ?

it causes abortion (at 4 - 6 months) in cattle!
- DH = dog
- Common presentation: may see a dog on a farm suffering from diffuse muscle atrophy and trouble ambulating hind limbs while cows are aborting
- unique thing: most other abortions occur later in gestation from brucella, listeria, lepto, etc.
- lesion: autolysis of fetus with granulomas in brain

8

Sarcocystis hirsuta - ?
S. hominis - ?
S. cruzi - ?
all affect what animal?

S. hirsuta = cats
S. hominis = humans
S. cruzi = dogs
all affect cows

9

lifecycle of sarcocystis

carnivore eats cow with encysted muscle, cysts form sporocysts that are shed in feces and eaten by cows - sporocysts hatch and invade muscle to form cysts - all in 10 weeks

10

what are the CS of sarcocystis in cows

how is it prevented?

CS: fever, anorexia, salivation, weakness, muscle fasciculations, weight loss

prevention: stop carnivores from invading area

11

Trypanosoma brucei
vector?
causes what in cattle? humans?
CS

vector = tsetse fly
causes Nagana in cattle
causes African sleeping sickness in humans
CS = fever, anemia, weight loss, sleeping sickness

12

Trypanosoma cruzi
what disease does it cause?
vector?
what organ systems are affected?

Chagas disease
vector = Reduvid beetle
affects nervous, digestive and cardiac systems