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 (B)</p> Signup and view all the answers

What is the predominant species in the Americas and Australia?

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

How do hookworm larvae enter a human host?

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

Which method is most commonly used to diagnose hookworm infection?

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

What is the length range of adult female Ancylostoma duodenale?

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

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

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

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

<p>4 weeks (D)</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 (D)</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 (C)</p> Signup and view all the answers

What is the size range of Strongyloides stercoralis male worms?

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

How are hookworm infections generally treated?

<p>With albendazole for 1-3 days (A)</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 (C)</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 (B)</p> Signup and view all the answers

Which type of life cycle does Strongyloides stercoralis exhibit?

<p>Free-living cycle (A)</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 (C)</p> Signup and view all the answers

What is the most typical symptom of enterobiasis?

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

Where do gravid females migrate to oviposit in enterobiasis?

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

What is retroinfection in the context of enterobiasis?

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

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

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

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

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

How long can Taenia saginata survive in the upper jejunum?

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

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

<p>Scolex (B)</p> Signup and view all the answers

How many suckers does the scolex of Taenia saginata possess?

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

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

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

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

<p>Proglottids (A)</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 (B)</p> Signup and view all the answers

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