Parasitic nematode worms being held by a laboratory technician. These are Ascaris lumbricoides worms,from the intestines of a child in Kenya. This nematode worm parasitizes the human small intestine. Fertile eggs are passed in the faeces. When swallowed,the larvae hatch from the eggs,invade the intestinal mucosa,and are carried in the blood to the lungs. The larvae mature in the lungs,then ascend the bronchial tree to reach the throat. There,they are swallowed. Upon reaching the small intestine,they develop into adult worms,completing the life cycle | |
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Credit: | Science Photo Library / CDC |
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