How do you get worms in your nose?
Christopher Snyder
Updated on February 21, 2026
Ascaris lumbricoides
Ascaris lumbricoides is the "large roundworm" of humans, growing to a length of up to 35 cm (14 in). It is one of several species of Ascaris. An ascarid nematode of the phylum Nematoda, it is the most common parasitic worm in humans.
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