Good, now stop trying to kill small harmless bacterias and try to kill parasitic worms. Then you can call your zapper a device which kills parasites (including parasitic worms), which is not the case for now. As mentionned by others zappers sellers you can kill uni cellular organisms (viruses, bacterias, yeasts, protozoas) only by using a high enough voltage (and my past experiments confirm this, i have managed to get rid of several warts this way)