Self-steralizaing door handle
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The best defense against common communicable diseases is prevention. Door knobs and handles are covered with a huge amount of microbes so why not create self-steralizaing door handles?
I suggest creating a door handle that continuously sterilizes itself with a UV light, only taking a break when you actually use it. There will be some kind of switch in the handle's frame to toggle the sanitizing illumination on and off.