Parasitology: Strongyloides stercoralis Characteristics
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Questions and Answers

What is the size difference between Ancylostoma duodenale and Necator Americanus?

  • A. duodenale is slightly longer but thinner than N. americanus
  • A. duodenale is smaller and thinner than N. americanus
  • A. duodenale is thinner but longer than N. americanus
  • A. duodenale is larger and thicker than N. americanus (correct)

    • Which clinical manifestation is associated with Filariform larvae breaking through pulmonary capillaries and entering the alveoli?

  • Cutaneous larva migrans
  • Hypoalbuminemia
  • Bronchitis and bronchopneumonia (correct)
  • Ground itch

    • What is the common treatment for both Ancylostoma duodenale and Necator Americanus?

  • Mebendazole (correct)
  • Praziquantel
  • Ivermectin
  • Albendazole

    • How do the anterior ends of Ancylostoma duodenale and Necator Americanus differ?

    <p>A. duodenale bends in the opposite direction of the body curvature, while N. americanus bends in the same direction</p> Signup and view all the answers

    Which larval stage of Strongyloides stercoralis is commonly seen in stool specimens?

    <p>Rhabditiform larvae</p> Signup and view all the answers

    What diagnostic technique is recommended to demonstrate rhabditiform larvae in cases of Strongyloides infection?

    <p>Harada-Mori culture</p> Signup and view all the answers

    Which of the following is a common clinical manifestation of strongyloidiasis?

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

    What is the recommended treatment for Strongyloides stercoralis infection?

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

    What distinguishes hookworm from Strongyloides based on larval characteristics?

    <p>Forked tail in hookworm</p> Signup and view all the answers

    What is the characteristic feature of filariform larvae of hookworms?

    <p>Pointed tail</p> Signup and view all the answers

    What is the mode of transmission of human pinworm (Enterobius vermicularis)?

    <p>Person-to-person transmission</p> Signup and view all the answers

    "Enterobiasis" refers to an infection caused by which parasite?

    <p><strong>Enterobius vermicularis</strong></p> Signup and view all the answers

    "Eggs on the perianal folds" is a diagnostic stage characteristic of which parasite?

    <p><strong>Enterobius vermicularis</strong></p> Signup and view all the answers

    Which diagnostic method is used to detect adult worms in cases of Enterobius vermicularis infection?

    <p>Nocturnal examination</p> Signup and view all the answers

    Which of the following is a common symptom of hookworm infection in humans?

    <p>Blood-streaked diarrhea</p> Signup and view all the answers

    What is the diagnostic stage used for lab diagnosis of hookworm infection?

    <p>Unsegmented ovum</p> Signup and view all the answers

    Which type of hookworm tends to occur in cooler and drier regions?

    <p>Necator americanus</p> Signup and view all the answers

    What is the treatment for hookworm infection in humans?

    <p>Oral administration of mebendazole</p> Signup and view all the answers

    Which diagnostic method is used to demonstrate eggs in the feces for hookworm infection?

    <p>FECT examination</p> Signup and view all the answers

    What is a common clinical manifestation of hookworm infection?

    <p>Rectal bleeding with abdominal cramps</p> Signup and view all the answers

    Which parasite is responsible for causing hookworm infection in wild and domestic dogs and cats?

    <p>Ancylostoma caninum</p> Signup and view all the answers

    What does the diagnostic stage look like in a hookworm ovum?

    <p>'Barrel-shaped with protruding mucous plug at each pole'</p> Signup and view all the answers

    'Rectal relapse' is associated with which parasitic infection?

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

    What is a key feature of the ova for Ascaris lumbricoides?

    <p>'Surrounded by a thick, transparent shell'</p> Signup and view all the answers

    What is the mode of transmission for Trichuris trichiura?

    <p>Skin penetration</p> Signup and view all the answers

    Study Notes

    Hookworms

    • Ancylostoma duodenale is larger than Necator Americanus
    • Filariform larvae breaking through pulmonary capillaries and entering the alveoli can cause coughing, chest pain, and hemoptysis
    • Both Ancylostoma duodenale and Necator Americanus are treated with mebendazole, albendazole, or pyrantel pamoate
    • Ancylostoma duodenale has a distinctive buccal capsule, while Necator Americanus has a mouth with four pairs of teeth

    Strongyloides

    • The rhabditiform larval stage of Strongyloides stercoralis is commonly seen in stool specimens
    • The diagnostic technique recommended to demonstrate rhabditiform larvae is the Baermann apparatus or agar plate method
    • A common clinical manifestation of strongyloidiasis is bronchospasm, and in severe cases, it can cause respiratory failure
    • The recommended treatment for Strongyloides stercoralis infection is ivermectin or thiabendazole
    • Hookworms can be distinguished from Strongyloides based on larval characteristics, with hookworms having a longer and more slender body
    • The characteristic feature of filariform larvae of hookworms is their ability to break through pulmonary capillaries and enter the alveoli

    Enterobius Vermicularis

    • Enterobiasis is an infection caused by the parasite Enterobius vermicularis
    • The mode of transmission of human pinworm is through ingestion of eggs contaminated with feces
    • The diagnostic stage characteristic of Enterobius vermicularis is the presence of eggs on the perianal folds
    • The diagnostic method used to detect adult worms in cases of Enterobius vermicularis infection is the Scotch tape test
    • A common symptom of Enterobius vermicularis infection is pruritus ani

    Hookworm Infection

    • A common symptom of hookworm infection in humans is abdominal pain and diarrhea
    • The diagnostic stage used for lab diagnosis of hookworm infection is the egg stage
    • The type of hookworm that tends to occur in cooler and drier regions is Ancylostoma duodenale
    • The treatment for hookworm infection in humans is mebendazole, albendazole, or pyrantel pamoate
    • The diagnostic method used to demonstrate eggs in the feces for hookworm infection is the Kato-Katz technique
    • A common clinical manifestation of hookworm infection is iron deficiency anemia and protein malnutrition
    • The parasite responsible for causing hookworm infection in wild and domestic dogs and cats is Ancylostoma braziliense and Ancylostoma caninum
    • The diagnostic stage of a hookworm ovum has a characteristic plug-like structure at one end
    • Rectal relapse is associated with Strongyloides stercoralis infection

    Ascaris and Trichuris

    • A key feature of the ova for Ascaris lumbricoides is the presence of a thick, mammillated shell
    • The mode of transmission for Trichuris trichiura is through ingestion of eggs contaminated with feces

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    Description

    Learn about the characteristics and diagnostic stages of Strongyloides stercoralis, a parasitic nematode commonly seen in stool specimens. Understand its morphology, life cycle, and associated clinical conditions.

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