How To Not Get Hand Foot & Mouth Disease

My 3 year old daughter came home last week with a small blue envelope with 5 cards in it. It was obviously an ingenious way to teach the very young that they should let their mother inspect for symptoms of the EV71 virus that causes Hand Foot & Mouth Disease which has claimed over 40 young lives in China this spring.

In context it makes a lot of sense but my first impression was shock because I saw card 4 before the others. Not being able to read Chinese I was wondering why the child in the illustration was mooning the teacher. ...