Who discovered the technique of preparing vaccine from attenuated pathogen and in which year?

Who discovered the technique of preparing vaccine from attenuated pathogen and in which year? Correct Answer Louis Pasteur, 1879

Louis Pasteur discovered the technique of preparing vaccine from an attenuated pathogen in 1879. This was the first true vaccine consisting of weakened micro-organisms against the disease chicken cholera.
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Related Questions

Statement 1: Voltage gain of -5 means that the output voltage has been attenuated. Statement 2: Voltage gain of -5db means that the output voltage has been attenuated.