query: Is there a vaccine for chicken pox?
passage: Varicella vaccine
Varicella vaccine, also known as chickenpox vaccine, is a vaccine that protects against chickenpox.[1] One dose of vaccine prevents 95% of moderate disease and 100% of severe disease.[2] Two doses of vaccine are more effective than one.[2] If given to those who are not immune within five days of exposure to chickenpox it prevents most cases of disease.[2] Vaccinating a large portion of the population also protects those who are not vaccinated.[2] It is given by injection just under the skin.[2]
passage: Zoonosis
The first vaccine against smallpox by Edward Jenner in 1800 was by infection of a zoonotic bovine virus which caused a disease called cowpox. Jenner had noticed that milkmaids were resistant to smallpox. Milkmaids contracted a milder version of the disease from infected cows that conferred cross immunity to the human disease. Jenner abstracted an infectious preparation of 'cowpox' and subsequently used it to inoculate persons against smallpox. As a result, smallpox has been eradicated globally, and mass vaccination against this disease 
ceased in 1981.