Roundworm
Date
Mid 20th Century
Description
Specimen of the nematode, Ascaris lumbricoides, a large parasitic worm that causes ascariasis. It is the most common parasitic worm in humans. An estimated one-sixth of the human population is at some point infected by a roundworm such as A. lumbricoides; people living in tropical and subtropical countries are at greater risk of infection.
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