What is a vaccine? and When we will get Corona Vaccine?

What is a Vaccine and What exactly is the Workflow in developing a Vaccine for the masses. 
He goes on with a step by step explanation of History of Vaccine and What are the different Phases of Vaccine Development.


Since the Current Scenario of COVID - 19 Corona epidemic , the Explainer Video is a must watch to understand thoroughly about  how Companies around the World are trying there best to develop Corona Vaccine as soon as possible with in the next few months 

In the words of  Dr. Mohapatra 
" Till the Vaccine is avaiable We must Follow the SMS rule i.e : Social Distancing , Mask and Sanitization "