5 kHz to 215 kHz is a good range to scan.
There are no original Rife frequencies over 4 MHz. You can follow them to do biofeedback can.
Approximate range of known organism's frequencies are:
Molds and mycotoxins 75 - 215 kHz
Bacteria and most viruses 275 - 450 kHz
Protozoa, roundworm, and flatworm 325 - 480 kHz
Warts 400 - 475 kHz
Tapeworms 425 - 515 kHz
Mites 675 - 880 kHz
For more details, please check the link: