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Edward Jenner, a physician in the late 18th century, is credited with being the "Father of Immunology." It was observed at the time that milkmaids had a lower incidence of smallpox than the general population. Jenner believed that the milkmaids caught cowpox from cows by contact with blisters. Jenner inoculated an 8 year old boy by transferring material from cowpox blisters of an infected person onto the scratched skin of the boy. Cowpox, although not the same as smallpox, is similar to the virus. People inoculated with cowpox material were able to be immune to smallpox.
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