Parasitology: Hookworm and Strongyloides stercoralis
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Questions and Answers

What is the most common symptom of hookworm infection?

  • Ground itch
  • Anemia (correct)
  • Gastrointestinal symptoms
  • Respiratory symptoms
  • Where are both N. americanus and A. duodenale found?

  • Middle East and North Africa
  • Europe and Oceania
  • Asia and Africa (correct)
  • The Americas only
  • Where do adult hookworms reside in the human body?

  • Colon
  • Large intestine
  • Stomach
  • Small intestine (correct)
  • How can larvae be used to differentiate between N. americanus and A. duodenale?

    <p>By rearing filariform larvae in a fecal smear</p> Signup and view all the answers

    What is the predominant species in the Americas and Australia?

    <p>N. americanus</p> Signup and view all the answers

    How do hookworm larvae enter a human host?

    <p>Through the skin</p> Signup and view all the answers

    Which method is most commonly used to diagnose hookworm infection?

    <p>Microscopic identification of eggs in stool</p> Signup and view all the answers

    What is the length range of adult female Ancylostoma duodenale?

    <p>10 to 13 mm</p> Signup and view all the answers

    What additional symptoms, apart from anemia, can occur in hookworm infection?

    <p>'Ground itch'</p> Signup and view all the answers

    How long can hookworm infective larvae survive in favorable environmental conditions?

    <p>4 weeks</p> Signup and view all the answers

    What is the characteristic feature of an Ascaris egg containing a larva?

    <p>It is infective when ingested</p> Signup and view all the answers

    How do hookworm larvae reach the small intestine after penetrating the skin?

    <p>Through blood vessels to the lungs</p> Signup and view all the answers

    What is the size range of Strongyloides stercoralis male worms?

    <p>1 mm</p> Signup and view all the answers

    How are hookworm infections generally treated?

    <p>With albendazole for 1-3 days</p> Signup and view all the answers

    What is the most distinctive aspect of the Strongyloides life cycle compared to other nematodes?

    <p>Potential for autoinfection</p> Signup and view all the answers

    What happens to the rhabditiform larvae of Strongyloides stercoralis that molt twice?

    <p>They become infective filariform larvae</p> Signup and view all the answers

    Which type of life cycle does Strongyloides stercoralis exhibit?

    <p>Free-living cycle</p> Signup and view all the answers

    How do the filariform larvae of Strongyloides stercoralis initiate the parasitic cycle in humans?

    <p>Penetrate the human host skin</p> Signup and view all the answers

    What is the most typical symptom of enterobiasis?

    <p>Perianal pruritus</p> Signup and view all the answers

    Where do gravid females migrate to oviposit in enterobiasis?

    <p>On the skin of the perianal area</p> Signup and view all the answers

    What is retroinfection in the context of enterobiasis?

    <p>Migration of larvae from skin to rectum</p> Signup and view all the answers

    Where is microscopic identification of eggs done to diagnose enterobiasis?

    <p>On a slide after pressing adhesive tape on perianal skin</p> Signup and view all the answers

    In which location is enterobiasis more common according to the text?

    <p>Temperate countries</p> Signup and view all the answers

    What is the estimated number of persons infected with enterobiasis in the United States?

    <p>40 million</p> Signup and view all the answers

    How long can Taenia saginata survive in the upper jejunum?

    <p>25 years</p> Signup and view all the answers

    Which part of the tapeworm body is responsible for holding onto the host's intestine?

    <p>Scolex</p> Signup and view all the answers

    How many suckers does the scolex of Taenia saginata possess?

    <p>4 suckers</p> Signup and view all the answers

    How many rows of hooklets are present on the scolex of Taenia solium?

    <p>2 rows</p> Signup and view all the answers

    In which part of the tapeworm body are the lateral genital pores located?

    <p>Proglottids</p> Signup and view all the answers

    How many lateral branches make up the uterus in the terminal segments of Taenia saginata?

    <p>15-20 lateral branches</p> Signup and view all the answers

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