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Pasteur's Research on Rabies
In the 18 fifties, pasteur had studied yeast and alcohol fermentation. He found that if he exposed a healthy rabbit to rabies, it developed rabies. That second rabbit also eloped rabies. And the second rabbit's infection seemed to be more virulent than the first. From there, pastour started to wonder whether it was possible to make an animal more resistant to rabes after it had already been bitten. Since rabes is caused by a virus rather than a bacter um, pasteur's efforts to replicate his earlier process failed. The longer they dried, the weaker the virus became. When he exposed other animals to a small amount of this attenuated virus, they