Serious as a US government sponsered heart attack my inquiring friend.
Here's a 600 page online book a man wrote about work he has done. I just found this myself 2 days ago. I find it utterly fascinating. I can't personally vouch for it yet, but I got the parts at a Radio Shack to make one of the devices he suggests. In short, you know how you can shatter a glass with (sound or otherwise) energy waves of that glass's resonant frequency? Same principle, except aimed at pathogens in the body, which resonate at an entirely much lower frequency than our own bodies. If he's lying, he sure went to great lengths. Guaranteed to be a hell of a thread if nothing else.