Common throughout the world, but survive best in the temperate zones. Worldwide 500 million infected. Rates are lower in tropical areas.
Females are diploid, develop from fertilized eggs.
Intense itching in the perianal region. In children - loss of appetite, insomnia and restlessness. Launder clothing and bedding. Treatment of Host - Vermox or Pyrantyl Pamoate. Eggs and worms adhere to the sticky surface of the swab .