JUAN GAERTNER / SCIENCE PHOTO LIBRARY JUAN GAERTNER / SCIENCE PHOTO LIBRARY
Illustration of an infection of Ascaris lumbricoides parasitic roundworm in the human intestine. Female roundworms can lay up to 200,000 eggs per day, which are excreted in the faeces and ingested by a new host through contaminated water or food. Infection causes abdominal pain, vomiting, diarrhoea and peritonitis. About 1 billion people are infected worldwide with this parasite.
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