In my years of experience going to bathrooms – sometimes even twice or thrice a day! – I have noticed that many people don't actually wash their hands even though it takes very little time and many public restrooms will even provide soap for their use!
Staggering, I know. Germs and poop flakes and all that other stuff just stays on a person's hands. Hell, I was once in a bathroom where someone brought in a scotch and soda, left it on the floor, took a dump, and continued drinking it!
Anyway, you should wash your damn hands. The students of Idaho teacher Jaralee Metcalf sure will. To prove the long term effect of bacterial nastiness and hand soap, Jaralee asked kids with different levels of handwashing habits to touch different slices of the same loaf of bread. They then sealed the bread in plastic baggies and let them wait for a month.
Here's a month later
Gross, right? Well, it gets worse. She also rubbed a piece of bread on all the Chromebook laptops in the class.
So. Lesson learned. WASH YOUR DAMNED HANDS