Page 45 - MNU-PM503 Parasitology practical book

Pharm D- Clinical Pharmacy Program Third Level Parasitology and virology (PM503)

2-Enterobius vermicularis

1- Adults:

-Adult male measures up to 2.5 mm long by
0.1-0.2 mm wide. It has a blunt posterior
end with a single spicule

- Adult female measure 8-13 mm long by
0.3-0.5 mm wide. It possess a long pointed
tail.

2- Egg:

a- D-shaped (plano-convex).
a- Size: 50X25 u.
b- Shell: double-walled.

c- Translucent.
d- It contains fully developed larva.

Definitive host - Only man.

Infective stage - Fully embryonated eggs containing fully developed

larvae
Mode of infection - Ingestion of eggs through contaminated food and drink .

- Autoinfection

- Retro-infection
- Air- borne infection

- Contact with patients (Direct hand to hand or indirect
contact by handling contaminated articles as clothes, bed

linens)

Diagnostic stage - Eggs

Site of localization - Adult worm live in large intestine

39