Remember that Star Trek episode where the fried egg sized virus took over the planet and Spock found that LIGHT killed the critter.  He used the fullest spectrum and blinded himself until McCoy identified the specific frequency of light required,  so that the damaging visible light wasn't necessary. Same here.  There is probably a specific frequency of light/sound that will obliterate CoV and the same for other cooties.  Only, the problem would be that it would eradicate the harmful cooties and limit the need for never-ending... Vaccines,  treatments,  medical device utilization and myriad other expensive treatment modalities.  Now WHO would be opposed to anything like THAT?