Vaccination

Vaccination is the process of administering weakened or dead pathogens to a healthy person, with the intent of conferring immunity against a targeted form of a related disease agent. The term was coined by Edward Jenner and adapted by Louis Pasteur for his pioneering work in vaccination. Vaccination (Latin: vacca—cow) is so named because the first vaccine was derived from a virus affecting cows: the cowpox virus, a relatively benign virus that provides a degree of immunity to smallpox, a c ...