A diagram showing how the bandage reacts to bacteria. It has three parts. In the first part, we see how when the bandage encounters any bacteria, it turns from green to yellow. Then, when only the drug-resistant bacteria remain, it turns to red. 
In the second part, we see that the antibiotics on the bandage kill the bacteria, and this corresponds to the bandage changing colour. When the bandage is red, only antibiotic-resistant bacteria remain, and light is applied to the red bandage to kill them. 
The third part explains the difference between drug-sensitive e-coli, which are killed when the bandage is yellow, and drug-resistant e-coli, which are killed when the bandage is red. There is a text-box below, which reads: 
E-coli is a type of bacteria that can make you very ill. E-coli is often used to test new medicines like this bandage, because scientists already know lots and lots about it, which means they can easily understand how it reacts! They then use the reactions of E-coli to predict how other bacteria might be affected by the treatment. Organisms that are used in this way are called model organisms.