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I use my elbow. It is the same recommendation as to cough to your elbow. You do not touch with your elbow on yourself or others so it is generally safe.

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Unfortunately not always practical due to poorly designed handles and lock mechanisms. I usually "sacrifice" my little finger for this when I have to use my hands, with the theory that I'm much less likely to put that finger in my mouth or eye etc.

My "Plan B" is the paper towel I dried my hands with. Though bathroom layout, missing trash cans, and lack of paper towels occasionally foil that.

in iffy situations I use my fathers method, which is the systematic prevention of transfer, even if you must touch things or people (doctor,pathologist,forensics) in less than ideal circumstances, hard to describe, easy to demonstrate.

Alternatively, the back of your knee:

https://www.youtube.com/watch?v=VkLfAG0AAzQ

Though this is more for the coughing/sneezing rather than the door opening.

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