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Who discovered vaccine against smallpox

$\begin{array}{1 1}(A)\;\text{Fleming}\\(B)\;\text{Pasteur}\\(C)\;\text{Koch}\\(D)\;\text{Jenner}\end{array} $

1 Answer

Jenner discovered vaccine against smallpox
Hence (D) is the correct answer.
answered Jul 10, 2014 by sreemathi.v
 
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