Lattice Vibration Destruction
For DNA viruses the pressure inside the capsid is around 60 atmospheres, and under this pressure, the viral DNA changes to crystalline form. References: 1 2
Like all crystals, crystalline DNA should have a lattice vibration absorption spectrum, and this means there will be certain frequencies of electromagnetic radiation which 
facilitate maximum energy transfer when incident on the crystal. So, by applying such a frequency to a patient, we may be able to heat the all the crystalline viral DNA in his body to a sufficient degree to destroy it.
This idea depends on our electromagnetic frequency being able to penetrate into the body, otherwise we will not be able to reach all the virus particles within a patient. If the frequency is within radiowave, microwave or the terahertz range, then there is no problem, as most electromagnetic frequencies in these ranges generally penetrate human tissue.
