You may already know that some bacteria can make you sick.
Unlike the bacteria that cause diseases and infections, most of the bacteria inside you right now are harmless and live peacefully side by side with the cells of your body. These bacteria work together with your cells to keep other unwanted invaders away and to help keep your body running smoothly.
In this story, you will see how good bacteria, antibiotics, and new technologies help keep the bad guys from taking over the body. Many bacteria appear throughout this story. They come in many different colors, shapes, and sizes.