Zapper does not always kill bacteria, viruses or worms.
It just makes them more vulnerable, and it makes herbal remedies several times more potent.
It is synergical power of zapper and parasite killing herbs that gives best results agains all parasites, bacteria, virus and yeast.
Some people do have very very very weak flora, and they DO GET strong candidiasis (as a result of good bacteria being killed) when using zapper+herbs, or even when simply doing Bowel Cleanse or liver flush, or only using herbs or only using zapper.
All people should use extra probiotics after every treatment with strong parasite killing remedies, especially if they also use zapper at the same time.