Without searching for an answer on Google, I’m going to just guess maybe Louis Pasteur. He made the rabies vaccine and now has a famous institute named after him in Paris. I am sure there were many other scientists skirting around the idea of vaccines before Louis, but although they might have had ideas no one really know how a vaccine might work, it was more a bit of luck.
Let me know if you have any other questions!
Carmen
The earliest known reference to immunity was during the plague of Athens in 430 BC. Thucydides noted that people who had recovered from a previous bout of the disease could nurse the sick without contracting the illness a second time.
So the Greeks (as usual) were the first to recognise it!
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