ENTEROBIASIS (Enterobius vermicularis) These worm eggs are released from female worms around the anus, especially at night, so these worm eggs are only found on examination with 'anal swab'or by checking using 'cellophane tape'. Female adult worms can sometimes also be found in the perianal area. Egg: - ellipsoidal, one side is flat, the other is curved; - length 50 – 60 μm, width 20 – 30 μm; - hyaline-walled, transparent; - usually found already containing embryos at the stage 'tadpole'(tadpole). Adult Worms: - cylindrical in shape - at the anterior end there are 3 labia and a pair of alae in the form of widening of the cuticle dorsally & ventrally, called 'cephalic alae'. - double esophageal bulb. - ♂: length: 2 – 5 mm; diameter: 0.1 – 0.2 mm; posterior end strongly curved ventrally with distinct copulatory spicules; there are no governorates; has a small bursa that appears as the caudal alae. - ♀: length 8 – 13 mm, diameter: 0.35 – 0.5 mm; tapered tail; The vulva is located approximately ½ anteriorly TRICURIASIS (Trichuris trichiura) This worm infection often occurs in hot areas, often seen together withAscaris. Egg: - Humans get the infection by ingesting eggs that contaminate the soil - The eggs hatch in the small intestine and eventually attach to the mucosa of the large intestine. - Adult worms mature in about 3 months and begin producing eggs. - Eggs are barrel-colored, barrel-shaped with transparent buttons - The length is 50x54 µm and the width is 22x23 µm. - Eggs are released at the unsplit stage and become mature after 14 days. - Diagnosis is made by finding the characteristic eggs in the feces. Mature: - Much larger than pinworms. - Size: 35-50mm (female) and 30-45mm (male) long. The caudal part of the male worm is circular 360 degrees - Adult worms are rarely found in feces because they are attached to the intestinal wall. - The large posterior end is depicted as the whip handle while the thin anterior end is the whip, hence the name 'Whipworm'.