Both in real life and in Whyville, vaccines work by mimicking viruses, without actually making you sick. Vaccines set your immune system into motion to produce antibodies. These antibodies will protect your body against any viruses that look similar to the vaccine.

The trick is to design a vaccine that looks a lot like the virus but doesn't make you sick like the real virus. Learn more about how vaccines work.

To design your vaccine, choose a color from the palette by clicking on it. Then, click on the squares of the vaccine to paint it that color.

Palette	Pen	Vaccine	Virus