Transmission"/> Transmission"/> Transmission"/> Transmission"/> PoultryDVM Pathogens A-Z | Ascaridia galli

Ascaridia galli

Ascaridia galli, also known as "the chicken roundworm", is a large, white worm that is known for invading the small intestines of chickens. It has also been reported in turkeys, ducks, geese, doves, and guinea fowl. They occur more often in free range and organic chicken flocks, however have been isolated from chickens in all types of production systems.

Transmission and life cycle
A. galli have a simple and direct life cycle.
Ascaridia galli life cycle in chickens
They are transmitted to chickens through ingestion of an embroyonated egg, shed in the droppings of an infected host. Once consumed by the chicken, it hatches in the oroventriculus or duodenum where em>A. galli larvae roam freely for 9 days prior to feeding on the surrounding tissue and returning to the lumen where they grow into adults within 28 to 30 days.

Once shed by infected birds into the environment, A. galli eggs take 10 to 12 days to become infective, but are very resistant to environmental conditions and able to survive in a wide range of temperatures. They have been reported to be capable of remaining in the soil for up to 66 weeks under certain environmental conditions.

A. galli Egg Appearance
A. galli eggs are elliptical and thick-shelled, measuring 70 u to 80 u by 45 u to 50 u.


  • chickens
  • turkey
  • ducks
  • doves
  • geese
  • guinea fowl

Associated Diseases