parasitology - large animal worms Flashcards
Dictyocaulus arnfeldi
- seen in what animals
- DH
- dx
horse lungworm
- DH = donkeys seen in horses housed around donkeys
- dx = baermann
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
Dictyocaulus filarial
- seen in what animals
- clinical signs
- goat lungworm
- bronchitis in goats
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
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
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
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
Sarcocystis hirsuta - ?
S. hominis - ?
S. cruzi - ?
all affect what animal?
S. hirsuta = cats
S. hominis = humans
S. cruzi = dogs
all affect cows
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
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
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
Trypanosoma cruzi
what disease does it cause?
vector?
what organ systems are affected?
Chagas disease
vector = Reduvid beetle
affects nervous, digestive and cardiac systems
