A one-celled organism called cholera could kill your chickens in one day. Louis Pasteur went on his yearly vacation. When he returned to work, his assistants didn’t read the labels on the bottles of cholera bacteria. They handed him older bacteria and Pasteur gave it to the chickens he was experimenting. Pasteur expected them to die, but the chickens got mildly sick and were perfectly well the next day. Pasteur had discovered the vaccine for cholera. The chickens had immunity because their bodies had already developed antibodies from the weak bacteria. Farmers and other people were free of losing their livelihood due to cholera because of Louis Pasteur.
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