Life cycle of Enterobius Vermicularis
Man is definitive host and there is no intermediate host.
Life cycle of this worm is completed in single host.
Infection occurs by ingestion of egg which contain larvae, by fingers nail, infected host, linen etc.
Which scratching Perianal skin containing egg.
The eggs are swallowd when hands are not properly washed.
After that egg enter in gastrointestinal tract where egg's dissolve and larvae is released.
Larvae escape in small intestine and develop into male and female adult worms.
The male worm fertilize the female worm and dies.
Gravid (fertilized) female then migrate to caecum of large intestine and remain there until eggs develop.
At night, fertilized female comes out of anus to lay agg on Perianal skin.
Irritation occur on Perianal region due to worm egg what person scratch perianal skin containing egg and enter in finger nail and cycle is repeated.
1. Human ingest infective fertilized egg by contamination of finger during scratching from mouth egg mouth egg enter Gastrointestinal tract, where larva is released.
2. Adult in intestine male worm fertilize female worm and dies.
3. Fertilized female then move to caecum of large intestine and colon untill egg mature.
4. Migration of female worm from anus at night.
5. Deposition of eggs in Perianal areas.
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