KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Parasitic nematode worm (Ascaris lumbricoides), computer illustration. A. lumbricoides is a parasite of 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.
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