Would you use a 8-year boy as guinea pig to test a theory for the treatment of a deadly infection disease?

Smallpox was a very serious illness many centuries ago. Infected people suffered from fever, progressive skin rash (fluid-filled blisters) and even death. By the 18th century, people were desperate to find a cure. It was very common that milkmaids got infected with a similar disease called cowpox transmitted from infected udders to their hands during milking. There was a legend that milkmaids had “a special protection”. A scientist, Edward Jenner, thought that the milkmaids acquired the “special protection” due to a previous infection with cowpox. In 1796, he wanted to test his theory by taking matter from a milkmaid that had been infected with cowpox and using it to infect an eight-year-old boy. The child got the infection, but he recovered after a few days. Subsequently, he inoculated the child with matter from a recent smallpox victim, and the child did not develop the disease. In 1850, the vaccination became compulsory, and the eradication of smallpox was achieved in 1979.
For addition information:
https://www.cdc.gov/smallpox/about/index.html
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1200696/pdf/bumc0018-0021.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC495097/pdf/jclinpath00423-0016.pdf
https://biotech.law.lsu.edu/cphl/history/articles/jenner.htm#paperI

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