Enterobius vermicularis – Egg

  • Infective stage to human
  • Detected mostly in perianal scraping of infected human
  • Eggs partially embryonated when passed and become infective within a few hours; no development in soil
Diagnostic Features
  • Size: 55 µm x 26 µm (range: 50-60 µm 20-32 µm)
  • Shape: Flattened on one side and other side convex
  • Smooth, thin almost colourless transparent eggshell
  • May contain a C-shaped embryo
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