I bet that you are still infected by several kinds of parasitic worms, even if you have "zapped". Truth is you don't know because it is impossible to know which kinds of organisms are inside your body. (and also because the electric signal produced by a zapper does not kill all kinds of parasitic worms in the human body, or is poorly efficient at it (it certainly does not kill the big adult as some zappers sellers claims, without any proof of course...))