I use this worksheet when teaching a mini-unit on germs. During the fall I have a lot of sneezers and cough-ers who don't cover their mouths. I teach a short unit on germs and how they spread. To end the lesson I have students create their own germ, name it, and then write a germ fact on it.
I create a banner with our 'classroom germs' and hang it up on the wall as a reminder to cover mouths and wash hands!