What Are Worms?

Disease-causing worms are parasitic organisms that must live on or inside
another organism to survive.
Worms that cause human disease are parasitic organisms that must live
on or inside another organism to survive. An animal or human harboring
a worm is called its host. Worms live at the expense of the host and may
cause illness. Worms live part of their life cycle within the gastrointestinal*
tract and the organs of the digestive system. Worms may cause diarrhea or
malnutrition despite a healthy diet.

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