My naturopathic doctor said that it works for some people and for others it doesn't.
She had one patient who came in and had the bio-energetic assessment (BEA). The second time around the patient said she felt so much better using the rife machine. But according to the BEA second time around she actually had higher levels of the bacteria. The naturopath was worried that it was driving the bacteria deeper into the tissues.
She hasn't seen the patient since but is really curious how everything is because of the second BEA. It is an interesting theory but many people have sworn by the rife.
I guess just like everything else it depends on the person.
Sorry I don't have more information. I hope you find something that helps.