Polio Vaccine

Source: google.com In the second half of the 20th century, Polio was considered to be a highly infectious disease. Its virus damaged the brain and the spinal cord which led to paralysis. Many scientists were racing to create a polio vaccine but in 1950s, Jonas Salk won the race. His vaccine was composed of harmless polio virus which retained the ability to give immunity against the disease without going through the risk of infecting the patient. He tested this first upon his own children and then in 1954, the vaccine was given to a large number of children and proved to be successful. This discovery helped in eradication of a disease that was spreading and eating the lives of innocent children worldwide- indeed a marvelous revolution in Medical vaccination.