Strongyloides Stercoralis Lifecycle

Free-Living Cycle:

1) Rhabditiform larvae in the intestine are excreted in stool. 

2) Development into free-living adult worms.

3) Eggs are produced by female worms.

4) Rhabditiform larvae hatch from embryonated eggs.

5) Rhabditiform larvae develop into filariform (L3) larvae.

6) Infective filariform larvae penetrate the intact skin of the definitive host.

Parasitic Cycle:

7) The filariform larvae migrate by various pathways to the small intestine where they become adults.

8) Parasitic adult female in small intestine

9) Eggs deposited in intestinal mucosa. Rhabditiform larvae hatch and migrate to intestinal lumen.

10) Rhabditiform larvae in large intestine become filariform, penetrate intestinal mucosa (or skin) and migrate to other organs.



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