Parasitology: Faecal Egg Count
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Parasitology: Faecal Egg Count

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Questions and Answers

What is the characteristic shape of Trichostrongyles eggs?

  • Barrel shaped with bipolar plugs
  • Round and rough pitted outer shell
  • Oval and thin shelled (correct)
  • Elongated and tapering ends
  • Which parasite has eggs with a smooth brown shell wall surface and bipolar plugs?

  • Trichuris vulpis (correct)
  • Dirofilaria immitis
  • Ancylostoma spp.
  • Strongyloides stercoralis
  • What is the size range of Ancylostoma spp. eggs?

  • 72–90 × 32–40 μm
  • 295–325 × 5–7.5 μm
  • 65–90 × 34–50 μm
  • 52–79 × 28–58 μm (correct)
  • Which parasite has microfilariae in the blood with gently tapered heads and relatively straight tails?

    <p>Dirofilaria immitis</p> Signup and view all the answers

    What is the characteristic feature of Hookworm Ancylostoma spp. larvae?

    <p>Deep buccal cavity</p> Signup and view all the answers

    Which parasite has eggs that are the largest among ruminant trichostrongles?

    <p>Nematodirus spp.</p> Signup and view all the answers

    What can affect the concentration of eggs per gram of faeces?

    <p>The daily volume of faeces produced by the host</p> Signup and view all the answers

    Why may some eggs not float well in solutions of lower specific gravity?

    <p>They are heavier than others</p> Signup and view all the answers

    Which of the following parasites produces many more eggs per day than others?

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

    What can make it difficult to distinguish between eggs of different species?

    <p>The similarity in appearance of eggs from different species</p> Signup and view all the answers

    What is a characteristic of nematodes?

    <p>They have a complete digestive tract</p> Signup and view all the answers

    What is a characteristic of male nematodes?

    <p>They have a curved posterior end and copulatory structures</p> Signup and view all the answers

    What is the purpose of leaving the counting chamber to stand for 5 minutes?

    <p>To allow the eggs to float to the surface and the debris to settle at the bottom</p> Signup and view all the answers

    What is the calculation to determine the number of eggs per gram of faeces?

    <p>Count the number of eggs within the grid of each chamber and multiply by 50</p> Signup and view all the answers

    Why is it important to process only a few samples at a time?

    <p>To prevent the flotation fluid from destroying delicate eggs</p> Signup and view all the answers

    What is a factor that can influence the daily output of eggs by fertile female worms?

    <p>Host physiological factors such as stress or lactation</p> Signup and view all the answers

    What can affect the recognition or numbers of helminth eggs found in a faecal sample?

    <p>Number of factors, including host-physiological factors and chemotherapy</p> Signup and view all the answers

    What is the purpose of examining the subsample of the filtrate under the compound microscope?

    <p>To identify the type of parasite present</p> Signup and view all the answers

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