The Big Sneeze

In "The Big Sneeze" from "Sid the Science Kid," Sid's father, Mort, has a cold. He and Sid's mom keep telling Sid to wash his hands, but Sid doesn't quite understand why he needs to keep doing this. His parents explain that germs get on the hands and this what gives you a cold, but they're too small to see. Sid doesn't want to catch the cold, so he decides he needs to investigate this more at school.

Example of:
Disease-Prevention Aesop