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In page Cowpox:
"The first description of cowpox was given by Jenner in 1798.[8] "Vaccination" is derived from the Latin adjective vaccinus, meaning "of or from the cow".[9] Once vaccinated, a patient develops antibodies that make them immune to cowpox, but they also develop immunity to the smallpox virus, or Variola virus. The cowpox vaccinations and later incarnations proved so successful that in 1980, the World Health Organization announced that smallpox was the first disease to be eradicated by vaccination efforts worldwide.[9] Other orthopox viruses remain prevalent in certain communities and continue to infect humans, such as the cowpox virus in Europe and monkeypox virus in Central and West Africa.[citation needed]
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