Why were both Jonas Salk and Edward Jenner so important to science?

Jonas Salk and Edward Jenner were pivotal figures in the history of medicine due to their groundbreaking work in vaccine development. Edward Jenner is credited with creating the first successful smallpox vaccine in 1796, which laid the foundation for immunology and led to the eventual eradication of the disease. Jonas Salk developed the first effective polio vaccine in the 1950s, significantly reducing the incidence of this debilitating disease. Their contributions not only saved countless lives but also transformed public health practices and the approach to Infectious Diseases.