Question

Who discovered vaccine? And when ???

Answer 1

Ello

Smallpox vaccine, the first successful vaccine to be developed, was introduced by Edward Jenner in 1796. He followed up his observation that milkmaids who had previously caught cowpox did not later catch smallpox by showing that inoculated cowpox protected against inoculated smallpox.

hope its helps uhh

Answer 2

$\huge {\boxed {\bold {\color {red} {Answer:--}}}}$

EDWARD JENNER in 1796