Strongyloides Stercoralis Flashcards
Name the super family of Strongyloides Stercoralis.
Rhabditoidea
What is the common name for Strongyloides Stercoralis?
Threadworm
What are the hosts for Strongyloides Stercoralis?
Dogs, foxes, cats
Is Strongyloides Stercoralis zoonotic?
Yes!
What are the characteristic features of adult Strongyloides Stercoralis?
Slender hair-like nematodes less than 1 cm in length.
What are the characteristic features of the larvae and eggs of Strongyloides Stercoralis?
L1 about 600 micrometers, eggs with L1 are about 30x40 micrometers in size.
What is this image showing?
Strongyloides Stercoralis eggs with larvae
What is a unique feature typical of Strongyloides Stercoralis in this image?
Long esophagus that is 1/3 length of nematode
Is the life cycle direct or indirect for Strongyloides Stercoralis?
Direct
What are the two life cycle stages for Strongyloides Stercoralis?
Homogonic (parasitic) and Heterogonic (free-living)
Explain the life cycles for Strongyloides Stercoralis.
Homogonic life cycle: Eggs containing L1 and liberated L1 are passed in feces -> in soil L1 develop to L3 -> infective L3 penetrate host skin or oral mucosa -> they migrate to the heart, through the lungs, up the trachea, swallowed, then migrate to intestines -> they develop to adult females (ONLY) and pathenogenesis takes place. PPP 10-14 days
Heterogonic life cycle: In favorable environmental conditions free-living larvae hatch from eggs and develop in soil directly to adult males and females -> females lay eggs which develop into free-living L3 -> infect host percutaneously and per os.
Name two additional modes of transmission for Strongyloides Stercoralis.
Prenatal and Transmammary
What are the sites of infection for Strongyloides Stercoralis?
Adults in small intestine. Larvae in skin.
What are the pathogenesis and lesions for Strongyloides Stercoralis?
Adults cause inflammation in small intestine. Skin penetration by L3 causes erythematous reaction
List the clinical signs associated with infection caused by Strongyloides Stercoralis.
Diarrhea, anorexia, weight loss, urticaria
How is Strongyloides Stercoralis diagnosed?
L1 and eggs with L1 in fecal flotation. L1 recovered with the Baermann technique from fresh feces
What is the treatment and prevention for Strongyloides Stercoralis?
Regular treatments with anthelmintics
Who is at highest risk for zoonotic infection caused by Strongyloides Stercoralis?
Immunosuppressed humans
The most likely cause of death in Ancylostoma Caninum-infected puppies that die of peracute hookworm disease during the second week of life is:
a. renal failure
b. diarrhea
c. anemia
d. pneumonia
e. hepatic failure
c. anemia
