Roundworms Roundworms are intestinal parasites, which measure between 15 and 40 cm in length.
Infection occurs most frequently in warm humid countries with poor sanitation.
Infection occurs after eating roundworm eggs contained in contaminated food or by transmission from hand to mouth after contact with contaminated soil. Symptoms of adult roundworm infection, which are caused by physical obstruction, include vague abdominal or colicky pain. Migration of adult worms may also cause symptoms of abdominal tenderness, fever, constipation and vomiting.