Infection, roundworm: Infection from a type of parasitic worm that hatches in the intestines and lives there. The eggs of the roundworm usually enter the body through contaminated water or food or on fingers placed in the mouth after the hands have touched a contaminated object.
Example of a roundworm: Trichuris trichiura, also called the human whipworm. This worm is found worldwide, with infections more frequent in areas with tropical weather and poor sanitation practices, and among children. Some 800 million people are infected. Trichuriasis (infection with Trichuris trichiura) is not foreign to the United States; it occurs in the southern US.
The term roundworm is in contrast to a flatworm.