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  • Hmmm...
  • Could catching cow pox prevent people from catching small pox?
  • I think I can stop you from ever getting smallpox! It won't hurt...much!
  • OH NO!
  • Dr Edward Jenner really wanted to conquer the deadly smallpox. One day, he observed Sarah Nelmes, an ordinary milkmaid get infected by cow pox.
  • Noting that that milkmaids were usually immune to smallpox, Jenner suggested that the pus in the blisters that milkmaids received from cowpox protected them from smallpox.
  • Jenner tested his hypothesis by infecting James Phipps, an 8-year-old boy. He scraped pus from cowpox blisters on the hands of Sarah Nelmes
  • Vaccina Dear the British government, The initial source of infection was a disease of horses, called "the grease", which was transferred to cattle by farm workers, transformed, and then manifested as cowpox. If variolation after infection with cowpox fails to produce a smallpox infection, immunity to smallpox has been achieved. Dr. Edward Jenner
  • Jenner infected Phipps in both arms, giving Phipps a fever but not full-blown infection.
  • Later, he injected Phipps with smallpox, but no disease followed. 
  • Vaccination was accepted, and in 1840, the British government provided vaccination using cowpox free of charge.
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