Cowpox to the mild form of smallpox and the observation that dairy farmers were immune from smallpox inspired the first smallpox vaccine, created and administered by English physician Edward Jenner. The word “vaccination,” coined by Jenner in 1796, is derived from the Latin root "vaccinus", meaning of or from the cow. 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
1978 smallpox outbreak in the United Kingdom at the Regional Virus Laboratory, which was in East Birmingham Hospital). Parker died of smallpox at Catherine-de-Barnes on 11 September 1978. Special disease control measures had to be put into place for Parker's funeral. Ron Fleet from Sheldon, who at the time of Parker's death worked for Solihull funeral director Bastocks and later for the BBC at Pebble Mill, recalled that he was told that authorities would not allow the body to be stored in a fridge in case the virus managed to multiply: Parker's mother also contracted smallpox, on 7 September, despite being vaccinated against the disease on 24