How the word "vaccination" has come in to usage?

VACCINATION :

Vaccination 

    Traditional Indian and Chinese medicinal systems hoped to induce a mild form of smallpox that would create resistance against the disease.
    Two centuries ago, an English physician named Edward Jenner, realised that milkmaids who had cowpox didn't catch smallpox even during epidemics, cowpox is a very mild disease.
    Jenner tried deliberately giving cowpox to people and found that they were now resistant to smallpox, because the smallpox virus is closely related to the cowpox virus.
    'Cow' is 'Vacca' in Latin and cowpox is "vaccina". From these roots the word "Vaccination"  has come in to our usage.