Germ theory

Louis Pasteur: The man who discovered vaccination

Louis Pasteur (1822 - 1895): The next time you chomp on cheese or sip some wine, remember the French scientist Louis Pasteur who discovered that spoiled milk, fermented beer and wine, and many diseases are caused by bacteria. Millions of people are saved from bites from rabid dogs because of the rabies vaccine developed by Louis Pasteur. Bacteria are tiny, living organisms that are only visible under a microscope. More than 150 years ago, Pasteur discovered that heating milk between 60 to 100 degrees Celsius kills the bacteria....

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