noun, plural: vaccination
Edward Jenner first used vaccination as a method that prevented smallpox, i.e. by inoculating cowpox matter (vacca= cow, hence the term). Soon, vaccination became essential in boosting immunity against diphtheria, rubella, measles, polio, hepatitis A and B, and chickenpox, especially in young children. Recently, vaccines to protect the body from certain forms of cancers were made.