Question

how was the vaccine against smallpox devoloped?​

Answer 1

It is prepared in the laboratory, by certain chemicals. The natural medicine is the dung of the cow.

Answer 2

Answer:

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.