Who developed the smallpox vaccination?

Who developed the smallpox vaccination?

• A. Louis Pasteur
• B. Alexander Fleming
• C. Jonas Salk
• D. Edward Jenner

Answer: (D)

The key idea is who first used a harmless related infection to protect against a deadly one, creating the concept of vaccination. Edward Jenner connected cowpox to immunity against smallpox after noticing that milkmaids who caught cowpox rarely got smallpox. He tested the idea by inoculating a healthy boy with cowpox material, and later exposing him to smallpox; the boy did not develop the disease. This successful demonstration in 1796 showed that a milder infection could provide protection from a more dangerous disease, establishing vaccination as a preventive tool and starting the era of modern immunization. While later scientists like Louis Pasteur advanced vaccine science and others such as Jonas Salk developed vaccines for different diseases, Jenner’s work specifically founded the smallpox vaccination.

The key idea is who first used a harmless related infection to protect against a deadly one, creating the concept of vaccination. Edward Jenner connected cowpox to immunity against smallpox after noticing that milkmaids who caught cowpox rarely got smallpox. He tested the idea by inoculating a healthy boy with cowpox material, and later exposing him to smallpox; the boy did not develop the disease. This successful demonstration in 1796 showed that a milder infection could provide protection from a more dangerous disease, establishing vaccination as a preventive tool and starting the era of modern immunization. While later scientists like Louis Pasteur advanced vaccine science and others such as Jonas Salk developed vaccines for different diseases, Jenner’s work specifically founded the smallpox vaccination.