Most historians document the first vaccination to be around 1796 when English doctor Edward Jenner observed that people working in close proximity to cows were completely immune to the smallpox virus.
Going back to Dr Jenner's original observations he quickly came to the conclusion that somehow the workers were picking up the less dangerous cowpox virus which in turn left them completely immune to the far more dangerous smallpox.
After some experimentation he injected an 8 year old boy with a small amount of cowpox and confirmed his original hypothesis.
The picture above is of a young Bangladeshi girl taken in 1973 and demonstrates how severe the outbreak on the body was.
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