Parasites are organisms that derive nourishment and protection from other living organisms known as hosts. The illnesses they can cause range from mild discomfort to debilitating illness and possibly death. While some parasites use a permanent host, others go through a series of developmental phases using different animal or human hosts. They range in size, from tiny single-celled organisms to worms visible to the naked eye. Parasites may be present in food or in water and can be identified as causes of foodborne or waterborne illness in the United States. Taenia saginata/Taenia solium (Tapeworms).
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