Since the adoption of mass vaccination programmes, many diseases have been curbed. [[Smallpox]], a deadly disease responsible for the deaths of millions, has been mostly eliminated through vaccination. Responsible for an estimated 300 to 500 million deaths worldwide in the 20th century, effective vaccination programs of the 19th and 20th century were effective at curbing the disease, and in 1979 the World Health Organization declared smallpox to be eradicated. | Since the adoption of mass vaccination programmes, many diseases have been curbed. [[Smallpox]], a deadly disease responsible for the deaths of millions, has been mostly eliminated through vaccination. Responsible for an estimated 300 to 500 million deaths worldwide in the 20th century, effective vaccination programs of the 19th and 20th century were effective at curbing the disease, and in 1979 the World Health Organization declared smallpox to be eradicated. |