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Intestinal parasites that remain prevalent in the United States include Enterobius vermicularis, Giardia lamblia, Ancylostoma duodenale, Necator americanus, and Entamoeba histolytica.

These worms contain that infect humans

are not usually visible to the naked eye .

• example

protozoa, helminths, and ectoparasites

these are the mains of parasites