Louis Pasteur’s passion for laboratory experiments led to major, life-saving changes in medicine. His research targeted unusual problems from the spoiling of wine to disease in French silkworms. His wide-ranging efforts found evidence for the existence of germs and created advances in vaccination science. This graphic biography showcases Pasteur’s looks at microorganisms and his game-changing conclusions. It also explains the use of weakened viruses to boost the body’s immune system.