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Paper II — 2022 May (Supplementary) (2010 Scheme) — Q8

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Paper II
2022 May (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Draw and label Ancyclostoma ova

Q82 marksShort Notes

Answer

A labelled diagram cannot be rendered in this text-based answer; the description below covers the key structural/labelling features.

Egg (ovum) of Ancylostoma duodenale (hookworm):

  • Shape: oval to elliptical.
  • Shell: thin, smooth, colourless/transparent (non-bile-stained), doubly refractile.
  • Contents: typically contains a developing embryo at the 4–8-cell cleavage stage when passed in fresh stool — an important labelling feature (unlike, e.g., Enterobius eggs, which contain a fully formed larva).
  • Size: approximately 60 μm × 40 μm.
  • A clear space is visible between the developing embryo/cells and the egg shell.

Note: Necator americanus (the other major hookworm species) produces eggs that are essentially morphologically indistinguishable from Ancylostoma duodenale eggs on routine stool microscopy — species differentiation between the two requires examination of adult worm mouthparts (buccal capsule with cutting plates in Necator versus teeth in Ancylostoma) or larval culture, not egg morphology alone.

  1. 1General Parasitology

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