NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY NATIONAL LIBRARY OF MEDICINE / SCIENCE PHOTO LIBRARY
The French chemist and microbiologist Louis Pasteur (1822-1895), centre left with white beard, being honoured at the university of La Sorbonne in Paris . He is considered the greatest physician of all times and the "father" of the germ theory of diseases. He strongly believed that diseases were caused by tiny organisms and transmitted from individual to individual. His researches brought him to the development of two vaccines: the first against anthrax, a major disease of cattle and the second against rabies. Pasteur also deviced a process, pasteurization, which preserves food from souring and is now widely applied.
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