Nematodes Key Characteristics and Life Cycles Quiz
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Questions and Answers

What is the term used to describe the rise in egg count that occurs in spring?

  • Epidemiological spike
  • Spring oviposition peak
  • Spring infection surge
  • Periparturient rise (correct)

    • What is considered a potential misconception regarding the winter strategy of hypobiosis?

  • Spring emergence leads to a decrease in infection rates
  • Nematodes can only survive on pasture in winter
  • L3 cause 'self-cure' or premonition
  • Ewes lose immunity around lambing (correct)

    • In the nematodes life cycle, what stage comes after L4 but before the Adult stage?

  • L5 (correct)
  • E
  • L1
  • L2

    • When does the Urquhart et al., 1996 text focus on the usefulness of fecal egg counts?

    <p>In determining when heavy infections occur</p> Signup and view all the answers

    Which term describes the stage of the nematode life cycle involving mff (mature free-living) larvae?

    <p>L5</p> Signup and view all the answers

    What stage of the nematode life cycle is responsible for the 'self-cure' or premonition effect mentioned?

    <p>L3 larvae</p> Signup and view all the answers

    When do ewes lose immunity, leading to higher infection rates?

    <p>-2 to +8 weeks post-lambing</p> Signup and view all the answers

    What is emphasized as essential for determining when and how to intervene in nematode infections?

    <p>'Understanding how the species perpetuates'</p> Signup and view all the answers

    What is the primary characteristic that distinguishes nematodes from other helminths?

    <p>All of the above</p> Signup and view all the answers

    How do nematode infections typically increase?

    <p>Through increased environmental exposure</p> Signup and view all the answers

    Which of the following statements about nematode life cycles is correct?

    <p>Nematode life cycles can be either direct or indirect</p> Signup and view all the answers

    Which of the following is NOT a method used by nematodes to ensure the survival of their species?

    <p>Asexual reproduction within the host</p> Signup and view all the answers

    How does grazing impact nematode infections?

    <p>Grazing increases nematode infections by exposing animals to contaminated pastures</p> Signup and view all the answers

    What is the relationship between pasture nutrition and parasite management in the context of nematode infections?

    <p>Improved pasture nutrition leads to better parasite management</p> Signup and view all the answers

    Which of the following is a primary clinical sign associated with Ancylostoma caninum infections?

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

    How does the morphology and behavior of Ancylostoma caninum relate to its pathology and clinical signs?

    <p>Its buccal capsule and tooth-like structures facilitate blood-feeding</p> Signup and view all the answers

    Which of the following is NOT a characteristic of nematodes (roundworms) mentioned in the text?

    <p>They have a segmented body structure</p> Signup and view all the answers

    What is the typical life cycle stage of nematodes that is infective to the final host?

    <p>L3 (third larval stage)</p> Signup and view all the answers

    What is the term used to describe the phenomenon where nematodes undergo arrested development or inhibited development to survive unfavorable conditions?

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

    In the context of nematode life cycles, what does the term 'periparturient rise' refer to?

    <p>An increase in the number of nematode eggs or larvae around the time of giving birth</p> Signup and view all the answers

    Which of the following is NOT a means of survival or transmission mentioned for nematodes?

    <p>Undergoing metamorphosis to a pupal stage</p> Signup and view all the answers

    What is the term used to describe the phenomenon where nematode larvae are rapidly rejected or excluded from a host due to a previous exposure and immune response?

    <p>Immune exclusion</p> Signup and view all the answers

    Which of the following statements about nematode life cycles is TRUE according to the text?

    <p>Direct life cycles involve an infective larval stage (usually L3) that is not enclosed in an egg</p> Signup and view all the answers

    Which of the following statements about the immune response to nematodes in sheep is TRUE?

    <p>Hypersensitized sheep exhibit increased peristalsis of the gut to expel larvae</p> Signup and view all the answers

    What is the primary mode of infection for Ancylostoma caninum?

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

    Which of the following is NOT a key characteristic of nematodes discussed in the text?

    <p>Requirement for an intermediate host</p> Signup and view all the answers

    In the context of pasture management for nematode control, what does the term 'L3' refer to?

    <p>The third larval stage of the nematode life cycle</p> Signup and view all the answers

    According to the information provided, how long can L3 nematode larvae survive on pastures?

    <p>A few weeks to 3+ months</p> Signup and view all the answers

    What is the purpose of pasture rotations in the context of nematode control?

    <p>Both A and B</p> Signup and view all the answers

    Based on the information provided, what is the approximate duration of the prepatent period (time from infection to egg shedding) for nematodes on pastures?

    <p>23 days</p> Signup and view all the answers

    Which of the following statements about Ancylostoma caninum is TRUE based on the information provided?

    <p>Males have a copulatory bursa</p> Signup and view all the answers

    What is the primary factor that determines the duration of pasture rotations for nematode control?

    <p>All of the above</p> Signup and view all the answers

    What is the size of Ancylostomatoidea eggs?

    <p>60 x 40 m</p> Signup and view all the answers

    Which nematodes are responsible for cutaneous larval migrans?

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

    What is the impact of hookworms on host animals?

    <p>Anemia and pneumonia</p> Signup and view all the answers

    What is the main route of infection confirmation for hookworm disease?

    <p>Fecal examinations</p> Signup and view all the answers

    Which part of the host do adult hookworms primarily infect?

    <p>Small intestine</p> Signup and view all the answers

    What type of modifications are present in the buccal capsule of hookworms?

    <p>Teeth and cutting plates</p> Signup and view all the answers

    Which stage of hookworms is responsible for feeding on blood?

    <p>L4 / early mature</p> Signup and view all the answers

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