Ask the doctor if when imfected travelers cross the border, the worms drop out of their rectum as they cross. Then ask if any are contagious, or if any of those people might have prepared food you ate. Ask if positive parasitic infections are mandatory to report to the CDC. If not, where are they compiling their data from?
Ask him how many different techniques their are for doing an O&P and which parasites were checked for in your specimen.
Ask him what a Kato-Katz is.
Then ask for a refund.