UV-C has no effect on the development of germ immunity. Chemical chemicals break down bacteria, resulting in the formation of certain resistances. UV-C does not include any chemicals. It works in a very different way than chemical compounds. Germs have little possibility of developing a resistance since the light is literally sending large quantities of energy straight to the germ’s DNA or RNA. It’s the equivalent of stating bacteria will develop a resistance to heat. While it is conceivable for a few very uncommon bacteria, it is not possible for the majority of germs, and it is much more “fanciful” for UV-C.