Germ theory of disease

Pasteur surveyed the evidence and synthesized it into a theory that contagious diseases are caused by microorganisms. It revolutionized medicine, leading to the prevention and treatment of diseases and significantly increasing life expectancy.
 Louis Pasteur France 1862 Germ theory of disease

Pasteur surveyed the evidence and synthesized it into a theory that contagious diseases are caused by microorganisms. It revolutionized medicine, leading to the prevention and treatment of diseases and significantly increasing life expectancy.