Long before I ever heard of CV, I made a practice of avoiding touching such surfaces with my hands, a trick I picked up from my dear late mother.
If I don’t have a paper towel for a door knob, I will just use my own clothing as a barrier between my hand and the door knob. Light switches get my elbow, and flushing is done with my foot. In a restaurant, my hands are washed after I have handled the menu, and I use a napkin to handle the salt shaker, etc.
My adult children have snickered at me for years. I think I am getting the last laugh now.
Your dear late Mother was wise.
I hope your kids are paying attention now..
;-)