Who discovered the technique of preparing vaccine from attenuated pat – McqOptions

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1.	Who discovered the technique of preparing vaccine from attenuated pathogen and in which year?
A.	Edward Jenner, 1796
B.	Louis Pasteur, 1879
C.	Robert Downey, 1856
D.	Von Behring, 1950
Answer» C. Robert Downey, 1856

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