Nematode Quizbee Review
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Questions and Answers

Which nematode is primarily known for causing infection through the ingestion of contaminated food or water?

  • Wuchereria bancrofti
  • Enterobius vermicularis
  • Trichinella spiralis (correct)
  • Ancylostoma duodenale
  • What symptom is most commonly associated with infection from Ancylostoma duodenale?

  • Skin rashes
  • Fever and chills
  • Severe diarrhea
  • Iron-deficiency anemia (correct)
  • Which of the following nematodes is known for being transmitted via a fecal-oral route and can lead to severe intestinal disturbances?

  • Trichuris trichiura (correct)
  • Strongyloides stercoralis
  • Ascaris lumbricoides
  • Necator americanus
  • What is the unique feature of the filariform larva in Strongyloides stercoralis regarding its infection mechanism?

    <p>It can penetrate human skin.</p> Signup and view all the answers

    Which nematode is directly related to the development of lymphatic filariasis?

    <p>Wuchereria bancrofti</p> Signup and view all the answers

    Which diagnostic test is most effective for identifying Enterobius vermicularis eggs?

    <p>Cellophane tape test</p> Signup and view all the answers

    What is the primary larval form of Trichinella spiralis responsible for causing infection?

    <p>Encysted larva</p> Signup and view all the answers

    What is a common complication of chronic infection with Ascaris lumbricoides?

    <p>Intestinal obstruction</p> Signup and view all the answers

    How do humans become infected with Angiostrongylus cantonensis (rat lungworm)?

    <p>Ingestion of undercooked snails or slugs</p> Signup and view all the answers

    What is the primary pathological effect of Ascaris lumbricoides migrating through the lungs?

    <p>Pneumonitis and eosinophilic response</p> Signup and view all the answers

    What treatment is recommended for Wuchereria bancrofti infection?

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

    What stage of Trichuris trichiura develops in the soil before becoming infective to humans?

    <p>Embryonated egg</p> Signup and view all the answers

    Which nematode is capable of autoinfection in humans, allowing persistent infections for years?

    <p>Strongyloides stercoralis</p> Signup and view all the answers

    What is the distinguishing morphological feature of Ancylostoma duodenale compared to Necator americanus?

    <p>Buccal capsule with teeth</p> Signup and view all the answers

    What is a common symptom of infection with Ascaris lumbricoides?

    <p>Respiratory difficulty</p> Signup and view all the answers

    What is a potential long-term consequence of untreated Wuchereria bancrofti infection?

    <p>Lymphatic filariasis</p> Signup and view all the answers

    Which nematode's life cycle includes both direct and indirect development with free-living and parasitic phases?

    <p>Strongyloides stercoralis</p> Signup and view all the answers

    What is the key diagnostic feature of Angiostrongylus cantonensis in cerebrospinal fluid (CSF)?

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

    Which nematode can cause rectal prolapse in heavy infections, particularly in children?

    <p>Trichuris trichiura</p> Signup and view all the answers

    Which organ is primarily affected in severe Trichinella spiralis infection?

    <p>Skeletal muscles</p> Signup and view all the answers

    What is the minimum infective dose for Ascaris lumbricoides eggs to establish infection in humans?

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

    What is the primary method of controlling filariasis caused by Wuchereria bancrofti?

    <p>Mass drug administration (MDA) programs</p> Signup and view all the answers

    What role does a paratenic host play in the life cycle of Angiostrongylus cantonensis?

    <p>Enhances transmission to humans</p> Signup and view all the answers

    Which of the following is a common symptom of a Trichuris trichiura infection?

    <p>Abdominal pain</p> Signup and view all the answers

    Study Notes

    Nematode Quizbee Review

    • Question 1 (Easy): The whipworm is Trichuris trichiura.

    • Question 2 (Easy): Enterobius vermicularis (pinworm) transmission is fecal-oral via contaminated hands/objects.

    • Question 3 (Easy): Strongyloides stercoralis penetrates human skin using filariform larva.

    • Question 4 (Easy): Lymphatic filariasis is associated with Wuchereria bancrofti.

    • Question 5 (Easy): The common clinical manifestation of Ancylostoma duodenale and Necator americanus infection is iron-deficiency anemia.

    • Question 6 (Medium): The stage of Trichinella spiralis encysted in striated muscles is larva.

    • Question 7 (Medium): Enterobius vermicularis eggs are detected using the cellophane tape test.

    • Question 8 (Medium): Humans become infected with Angiostrongylus cantonensis (rat lungworm) by ingesting undercooked snails or slugs.

    • Question 9 (Medium): The primary pathological effect of Ascaris lumbricoides migrating through the lungs is pneumonitis and eosinophilic response.

    • Question 10 (Medium): The recommended treatment for Wuchereria bancrofti infection is Diethylcarbamazine (DEC).

    • Question 11 (Difficult): The Trichuris trichiura stage that develops in soil before human infection is the embryonated egg.

    • Question 12 (Difficult): Strongyloides stercoralis is capable of causing persistent autoinfections in humans.

    • Question 13 (Difficult): The distinguishing morphological feature of Ancylostoma duodenale compared to Necator americanus is the buccal capsule with teeth.

    • Question 14 (Difficult): Strongyloides stercoralis has a life cycle that includes both direct and indirect development with free-living and parasitic phases.

    • Question 15 (Difficult): The key diagnostic feature of Angiostrongylus cantonensis in cerebrospinal fluid (CSF) is eosinophilia.

    • Question 16 (Difficult): Trichuris trichiura can cause rectal prolapse in children with heavy infections.

    • Question 17 (Difficult): Severe Trichinella spiralis infection primarily affects skeletal muscles.

    • Question 18 (Difficult): The minimum infective dose of Ascaris lumbricoides eggs in humans is 1 egg.

    • Question 19 (Difficult): The primary method for controlling Wuchereria bancrofti filariasis is mass drug administration (MDA) programs.

    • Question 20 (Difficult): A paratenic host harbors infective larvae of Angiostrongylus cantonensis but does not allow further development.

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