Who is credited with the first vaccine to protect against smallpox?

Question

Quizplus · Accepted Answer

Edward Jenner is credited with developing the first vaccine to protect against smallpox in 1796. He observed that milkmaids who had contracted cowpox, a similar but less severe disease, did not contract smallpox, leading him to develop a vaccine using live cowpox virus. The success of his vaccine led to widespread vaccination efforts and ultimately the eradication of smallpox.

Who Is Credited with the First Vaccine to Protect Against