The most interesting application I’ve seen mentioned was a proposal to shine far-UVC light directly at a patient during surgery. The idea is that it would kill most pathogens that might end up inside the patient while still being mostly harmless to the patient even when being shined inside them.
A core part of the article is that shorter wavelengths are used that don't penetrate as far, so they only cause DNA damage in outer layer cells of the skin that do not replicate. This would not be the case with an open surgical area.