Everything you need to know about vaccines
Vaccines have been hailed as the greatest achievement in the history of human medicine. The 20th century introduced several immensely successful vaccines to combat diseases such as hepatitis A and B, diphtheria, rabies, and measles. Other major accomplishments were the development of the polio vaccine in the 1950s and the eradication of smallpox in the late 1970s. Over the last century, vaccines saved hundreds of millions of lives throughout the world.