yes, after touching all the items the customers before you have just touched
( I like self-checkout or asking "Could you please scan this with your little gun ?" - sometimes explaining that I'm weird about other people touching my stuff.)
... reading The Art of the Comeback by DJT and
a whole chapter "The Press and Other Germs" devoted to how he's aware of germs on his hands and likes to keep his hands clean and wash them all the time.