Nice clarification, Jaguar57. I knew I must be missing something.
But here we disagree again. I am sure your immune system is staying low because you're infested with parasites again, who are the carriers of all 'disease', Epstein Barr included. If you keep killing any re-infestation from your latino neighbors/friends/acquaintances, it'll keep you free of the disease.
Of course if you let the parasites build up in between zappings (like a week or two), the amount of virus released from the dead parasites will be sufficient to start the disease up again. I'd advise, for true freedom, you zap every day. Just an hour or so (herbs once a week) and you'll no longer need to run the purifier continuously. :) You can have your immune system and life back.