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Paper II — 2020 February (Supplementary) (2010 Scheme) — Q5

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Paper II
2020 February (Supplementary) (2010 Scheme) · 40 marks · 120 min

Question

Draw the diagram of enterobius vermicularis egg with labelling

Q52 marksShort Notes

Answer

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

Egg of Enterobius vermicularis (pinworm):

  • Shape: asymmetrically oval, flattened on one side (“D-shaped” or “plano-convex”) — this asymmetry is the single most distinguishing labelling feature versus other nematode eggs.
  • Shell: thin, smooth, colourless (non-bile-stained), doubly refractile.
  • Contents: typically contains a fully developed larva at the time the egg is passed/collected (eggs mature and become infective rapidly, often within hours of being laid).
  • Size: approximately 50–60 μm × 20–30 μm.

Clinical/collection note for labelling context: the egg is deposited by the female worm on perianal skin at night (not typically found in routine stool), so specimen collection for diagnosis uses a perianal (Scotch/cellophane tape) swab taken in the early morning before bathing/defecation, rather than a stool sample.

  1. 1General Parasitology

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