Nonpathogenic intestinal protozoa are single-celled parasites that are commonly found in the intestines but never cause illness. These protozoa are harmless and do not require treatment. For more information, see our Fact Sheet.
Nonpathogenic (Harmless) Intestinal Protozoa
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This page last reviewed February 7, 2008
Centers for Disease Control and Prevention National Center for Infectious Diseases Division of Parasitic Diseases