I second this. It's a well-made zapper.

Remember though, Rickettsia is an INTRAcellular parasite. Zappers do not reach inside your cells.

However, plenty of people have had success with intracellular parasites anyway with zappers alone. I know of people who never had a single Herpes outbreak after they started using a zapper. Herpes is a virus, meaning it lives in your cells, just like Rickettsia does. So you may still benefit.