Hi there, my personal experience with the parasite zapper for myself as well as my dogs has been nothing short of amazing. Cures beyond anything allopathic vets couldn't touch. I don't know about your personal experience with protozoa but my experience with a lip fold pyoderma that 5+ years of clindamycin (sp) could not handle was cured...yes cured with daily zapping. I took the dogs off the drug within two weeks of beginning daily zapping and in the month it was healed. That was over a year ago and it hasn't returned. It was nasty rotting flesh on two of my cocker spaniels. I am running out of time today but I had to post this for your information. The price of the zapper is actually priceless.