Question

when was first vaccine introduced and by whom​

Answer 1

Answer:

Berners Lee 6august 1991

Answer 2

Answer:

Smallpox vaccine,

Explanation:

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.