Vaccine against smallpox was first developed by

1. Peter Goror
2. George Snell
3. Louis Pasteur
4. Edward Jenner

The correct option is D Edward Jenner
Vaccine is a preparation containing weakened or dead pathogens or antigenic proteins of pathogens. Vaccines are introduced into the body to induce the production of antibodies and memory cells and provide active immunity against the disease caused by the same pathogen.

Edward Jenner is considered as the father of immunology as he developed the first effective vaccine against smallpox by using live attenuated cowpox viral particles.