How to make a germ theory of disease history day exhibit visually engaging?

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Ex. I know someone doing the invention of the light bulb, and they made a big paper mache light bulb.
My partner thinks we should put a red cross in the background, but we never even address the red cross. Help please!

Answer: 
Do several experiments of growing bacteria (germs) in Petri dishes. They can be your visual exhibit of how easily germs spread.