Louis Pasteur accidentally discovered vaccination using attenuated microorganisms by injecting an old bacterial culture into chickens.

Name: Louis Pasteur accidentally discovered vaccination using attenuated microorganisms by injecting an old bacterial culture into chickens.
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Louis Pasteur accidentally discovered vaccination using attenuated microorganisms when he injected chickens with an old culture of cholera bacteria, expecting them to die. Instead, they became immune to a more virulent strain.

Louis Pasteur Accidentally Discovered Vaccination Using Attenuated Microorganisms by Injecting