Eggs of the parasite Ascaris lumbricoides, illustration

Bildnummer 13507902
Eggs of the parasite Ascaris lumbricoides, illustration
Unfertilized eggs of Ascaris lumbricoides, illustration. The eggs have a thick protective case, these thick-shelled eggs can survive unfavourable conditions of drought, buried in the soil. The adult worm (up to 35cm long) is an intestinal parasite of humans. Infestation can cause abdominal pain, vomiting, constipation, malnutrition and anaemia. The female worm lays large numbers of eggs in the human intestine which are excreted in the faeces and ingested by a new host via contaminated water or food. This infection is known as ascariasis.
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Credit: Science Photo Library / Kon, Kateryna
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