Enterobius vermicularis

The eggs of Enterobius vermicularis have dimensions of 50–60 µm in length and 20–30 µm in width. They are transparent and possess an elongated to oval shape, with a slight flattening on one side. Typically, these eggs are partially embryonated when they are shed from the host.

Diagnosing enterobiasis can be accomplished by using cellulose tape to collect samples from the anus of a suspected patient, especially in the morning before their first bowel movement. The eggs will adhere to the tape, and upon microscopic examination, they become visible, aiding in the diagnosis.

A Shell
B Larva

Adult males of Enterobius vermicularis can reach sizes of up to 2.5 mm in length and have a width of 0.1-0.2 mm. On the other hand, adult females are larger, measuring between 8-13 mm in length and 0.3-0.5 mm in width.

Males have a blunt posterior end and are equipped with a single spicule, which is a specialized copulatory structure. Females, on the other hand, possess a long pointed tail.

Both males and females have cephalic expansions, which are structures found at the anterior end of their bodies. These cephalic expansions play a role in their feeding and attachment to the host's intestinal wall.