Since parasites are pleomorphic, and it requires a different frequency to eliminate each kind, seems like you would need to know what their morphing cycles are, and have several zappers running simultaneously, in order to eliminate them, otherwise you will just be chasing them from one form to another, switching frequencies every time they morph to get away from the previous vibration.
*I'm noticing that combining supplements to combat bacteria, virus and fungus simultaneously seems to work rather well.