The scientist who formulated and propounded the "Germ theory of disease" is Louis Pasteur.
In 1861, the French chemist and microbiologist published his findings showing that specific microorganisms (or "germs") are responsible for fermentation, spoilage, and infectious diseases. His famous swan-neck flask experiments effectively disproved the long-held theory of "spontaneous generation," proving instead that living microbes come from other microbes in the environment. surgical techniques, dramatically reducing post-surgery patient infections.