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• Edward Jenner discovered the small pox vaccine in 1796-the first vaccine to be discovered.
• Anton Van Leeuwenhoek described the bacteria seen under microscope as ‘little animalcules’.
• Theory of spontaneous generation (abiogenesis) was put forth by English priest-John Needham.
• Salvarsan (magic bullet)-an arsenical compound to cure syphilis was introduced by Paul Ehrlich.
• The first human disease proved to be viral origin was yellow fever-by Walter Reed.

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