I do not depend on a Zapper to kill off intestinal parasites or flukes. Clark wrote that the Zapper is good for 'cleaning up' or mopping up the immature larva, bacteria, viruses, yeasts carried by various parasites but depended on the herbs and supplements for the mature forms. As far as I know it is not possible to kill off all intestinal parasites by zapping tho it may be if they were in the intestinal wall tissues and in contact with body fluids they might be affected.
Clark listed killing frequencies for common parasites but did not study the thousands of other parasites. My opinion is that a zapper which emits broad frequencies will be more likely to affect a greater number of parasites.