Turning back time to about 60 years ago, the polio vaccine was regarded as miracle. Post this successful clinical trial of the vaccine of the killer disease polio, the entire nation and also the whole world heaved a huge sigh of relief. Back then the same was recorded as the largest conducted clinical trial in the history of medicine.

Creator of this vaccine Jonas Salk was more than worshiped by many for more than just successfully creating this life saving vaccine. The vaccine was declared safe and effective then. However, people in the medical fraternity admit that had Jonas Salk been alive this very day, probably his greatest fear would be, if the polio immunity drops are administered below the prescribed level, polio disease could probably make a comeback.