Epidemiology & Risk Factors

Ascaris lumbricoides infection is one of the most common intestinal worm infections. It is found in association with poor personal hygiene, poor sanitation, and in places where human feces are used as fertilizer.

Ascariasis caused by Ascaris suum is found in association with pigs. People who raise pigs or use raw pig manure as fertilizer may be at risk for infection with Ascaris suum. Contact with pigs should be investigated as a potential cause upon diagnosis of ascariasis.

Geographic Distribution

The geographic distributions of Ascaris lumbricoides are worldwide in areas with warm, moist climates and are widely overlapping. Infection occurs worldwide and is most common in tropical and subtropical areas where sanitation and hygiene are poor.

Ascaris suum can be found wherever pigs are found.

Page last reviewed: February 15, 2018