Enterobius vermicularis, commonly known as the pinworm, is a parasitic nematode that infects the large intestine of humans. The document describes the diagnostic structures of E. vermicularis by presenting an image of one of its fertilized eggs found in a fecal sample. The egg is oval shaped, measuring 50-60 μm by 20-40 μm, with a thin colorless shell. Diagnosis is usually made by detecting the eggs on cellophane tape pressed against the anal skin, as the female pinworms lay their eggs perianally. This causes itching and rash around the anus. The image was captured using light microscopy at 1000x magnification after preparing the fecal