Medicine: Another Vaccine

Only 55 years ago great, meticulous Louis Pasteur (1822-95) began to realize that for every infectious disease there is a specific microorganism. That year chicken cholera was Pasteur's obsession. Dishes of the virus lay all around his Pans laboratory. Then, in the midst of his research he dashed away on a vacation. The virus died, but Pasteur did not know that.

Upon his return Pasteur injected some of the dead virus into a healthy chicken. Nothing happened. Astonished, he prepared a fresh batch of virulent virus and injected it into the same chicken. Nothing...

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