Heh, I had a patient once who was a bit off, and she became so unhinged at my putting a clean, laundered sheet on an exam table, demanding a new, unused one that had never been washed, that she refused to let me treat her and demanded to see my boss.
I had the patient sit in a chair while I went to get my boss, and when she came in to talk to the patient, the woman demanded a new sheet for the table (not a laundered one) because “someone lay on those laundered sheets before her”.
My boss, who was quite good, looked thoughtfully at the sitting woman, and said “Well, someone sat in that chair you are sitting in before you sat in it...”
At which the woman leaped from the chair like a scalded cat!
I audibly choked trying to keep from laughing!
Point is, people get a little crazy about this. The cleanliness of your own hands, and what you do with them in a clean/unclean situation, is your own responsibility. If we get some super bug that wipes people out, lemme tell you...it’s gonna get you, touch screen or not!
Germophobes will go first. Weaker immune systems. ;-)