Lecture 39 - Ascarids Flashcards
T/F: ascarids are large nematodes that infect the colon of hosts
FALSE - small intestine
T/F: ascarids have very hardy and resistant eggs
TRUE
what are common clinical signs of ascarids
- young hosts
- pot-bellied
- D+
- abdominal pain
- rough hair coat
the larval stages of which ascarids can infect other hosts
T. canis and T. cati
what is the appearance of ascarid eggs
thick-walled, have testured outer coats
what is the pathology of T. canis and T. cati
enteritis, inflammation, and hypersensitivity of the small intestine
contributes to fading puppy and kitten syndrome
how are T. canis and T. cati diagnosed
fecal centrifugation and antigen tests
describe T. canis transmission
- ingest (tracheal or somatic migration)
- transuterine
- transmammary
- ingestion of paratenic host
describe T. cati transmission
- ingest (tracheal migration)
- transmammary
- ingestion of paratenic host
toxacara canis has ___ PPP after transuterine transmission and ____ PPP after egg ingestion
3; 5
toxacara cati has ___ PPP after eating paratenic host
8
what are two rare conditions caused by toxocara
- verminous pneumonia
- intestinal obstruction
T/F: toxocara is less severe in kittens than puppies
TRUE
what are the two treatments for toxocara
- eliminate standing adult population
- eliminate recently matured adult worms
who should be dewormed in toxocara canis and cati infections
- female dog before parturition
- newborn puppies/kittens
what is a visceral larval migration
migration of larvae in tissues of aberrant host that cause granulomatous reaction
describe Baylisascaris procyonis life cycle
DH: raccoons
zoonotic (very aggressive) - visceral, ocular, and neural larval migrations
describe P. equorum pathology
- equine hosts < 2y/o
- respiratory signs, D+, potbellied, stunted growth, rough hair coat
how is P. equorum treated
fenbendazole at peak worm burden in foals at 5 months
describe A. suum pathology
- swine hosts, especially piglets
- “thumps”, D+, potbellied, stunted growth
- history of being on pasture
T/F: incomplete acquired immunity limits reinfection in older hosts for parascaris and ascaris
TRUE
what is the PPP of parascaris spp in horses
2.5-3 months
how is parascaris transmitted
ONLY fecal-oral
Describe parascaris larval migrations
- liver and lung effects
- allergic reactions and airway inflammation
- impaction
describe ascaridia galli
- large ascarid of poultry
- small intestine infection
- fecal-oral transmission
- enteritis, D+
describe heterakis gallinarum
- cecal worm of poultry
- cecal infection
- fecal-oral transmission and paratenic hosts
- carries H. meleagridis
T/F: adult H. gallinarum are non-pathogenic
TRUE
describe physaloptera spp.
- stomach worm of wildlife & pets
- Dung beetle IH
- causes gastritis and ulcers
how are physaloptera spp. diagnosed
- sedimentation
- V+ worm
- endoscopic exam
