In his later years, Pasteur's research on rabies vaccine became the brilliant culmination of his career. Although rabies was not very common at that time, its mortality rate was 100%. In order to develop a cure, Pasteur often risked his life to extract viruses from sick animals and collect the saliva of mad dogs. He made us respect him for his desperate spirit of science. After many troubles, he finally found a cure for rabies, made the original Pasteur rabies vaccine, and successfully treated a French boy who was bitten by a mad dog, becoming the first person in the world to save rabies patients.