Ascaris, hookworm, Strongyloides, the tapeworms, and the protozoans Giardia lamblia and Entamoeba histolytica form the majority of gastrointestinal parasites that have clinical significance in the United States. Of these, roundworms (e.g., Ascaris, Strongyloides, and Trichinella) typically are accompanied by peripheral blood eosinophilia. Diagnosis usually depends on examination of the feces for larvae or eggs. There […]