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Known as the 'Father of Immunology', Edward Jenner (17 May, 1749–26 January, 1823) was an English scientist. He is known for the invention of smallpox vaccine. Vaccination was a regular exercise but it could not prevent the disease from occurring. Edward Jenner decided to just add the element of prevention from occurring (Immunity) to the vaccine and used contact with cowpox disease for the purpose. He knew that milkmaids who were in contact with cows were immune to smallpox and contracted with a harmless disease cowpox, which never affected them in anyway. To test his theory he got pus from a milkmaid's body and inserted it in a small boy's arm and later exposed the boy to smallpox virus who was found immune. He tested it on several other boys before producing the final results. Though the invention was made in 1796 yet it was only after his death that it was accepted.