This book explains how pathogenic bacteria cause diseases, how the human immune system launches timely and effective defense mechanisms against bacterial infection, why the discovery and application of penicillin and streptomycin are so important, how scientists have created medicines to defeat bacteria, and why these bacteria might outsmart modern medicine.On the other hand, bacteria can be beneficial to humans: some bacteria live in harmony with the human body, and they are indispensable to our health. They also help in refining biological energy in the post-fossil fuel era, and in producing fermented food.With accessible language, illustrations and comics, this book tells the story of our tumultuous relationship with bacteria and how it has shaped history.