Vaccine
A vaccine is…well, we're already into political territory…
Etiology
The word “vaccine” comes from the Latin vaccinus from vacca, which means “cow”. That is because the cowpox virus was used to stimulate the immune system against the more harmful smallpox virus.
Vaccination
Vaccination is the process of introducing a vaccine into the body to produce immunity to a specific infectious organism. It is not the same as immunization (which has been mistakenly used interchangeably with vaccination), which is the process of conferring immunity, not necessarily through vaccination. Immunity is the capacity of the body to protect itself from the development of a disease due to exposure to an infectious organism. 1)
Vaccine History
'The Dark History of Vaccines'2) lists the many, many vaccine disasters throughout recent history and makes for a sobering read.