Human parasitic disease caused by nematode S. Stercoralis.
Mostly in tropical, subtropical area and temperate climate.
Affect 30-100 million annually.
Has two unique life cycle: Free life cycle and Parasitic life cycle.
Cause by direct contact with contaminated soil and recreational activities.
Children highly affected to bad sanitation.
S. stercoralis is a 2 mm long intestinal worm