Strongyloids (5) Flashcards
What is strongyloides stercoralis?
intestinal threadworm (dogs, humans)
What is the morphology of strongyloides stercoralis?
small thread-like worms in the small intestines
For strongyloides stercoralis, only the [males/females] are parasitic
females
What is the direct lifecycle of strongyloides stercoralis?
homogenic life cycle with parthenogenic females
heterogenic lifecycle with free-living male and female worms
What are ways strongyloides stercoralis have transmission to susceptible hosts?
percutaneous (penetrate skin, make it into blood supply through tracheal migration)
lactogenic
ingestion
autoinfection
What is the homogonic life cycle for canine strongyloidiasis?
only adult females are parasitic
reproduce parthogenically
lactogenic transmission to pups
auto infection within pups
In canine strongyloidiasis, ______ often precedes diarrhea, dehydration, death
coughing
Male strongyloids are not needed because females reproduce ________
parthogenically
For canine strongyloidiasis, what is the heterogonic lifecycle?
free-living adult worms
reproduce sexually
transmission to susceptible host
some remain in environment to continue the heterogonic lifecycle
For canine strongyloidiasis, the worms come from where? (2 things)
infected worms
free-living cycle
What is the clinical importance of strongyloides stercoralis?
primarily in puppies (puppy mills) immune-naive
immune-compromised
results in watery diarrhea, dehydration, death
verminous pneumonia
How do you diagnose strongyloides stercoralis?
1st stage larvae (~380 micrometer) usual diagnostic product
- direct smear
- larvated eggs
What is the treatment/prevention for strongyloides stercoralis?
for removal from gut: IVM, FBZ (fenbendazole)
nothing effective for tissue stages (just go into arrested development)
What is the zoonotic potential for strongyloides stercoralis?
widely assumed based on tissue studies
only 1 case of natural transmission dog to human documented
other evidence is confounding
What kind of eggs do strongyloides stercoralis have?
thin-shelled & larvated
