- Evidence of parasitic infection defined as having the following three items:Risk factors for parasitic disease (living in an endemic area, chronic gastrointestinal (GI) symptoms, travel within the last 6 months to an endemic area and/or chronic immunosuppression) AND An absolute eosinophil count more than twice the upper limit of normal AND Evidence of parasitic colonization or infection on stool evaluation for ova and parasites. Note that stool ova and parasite evaluation will only be conducted in patients with both risk factors and an eosinophil count more than twice the upper limit of normal.