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From Viral Vaccines to Messenger RNA Vaccines

Today, the swiftness of epidemics of infectious disease is alarming. To date vaccines have been an enormous success for not only preventing but completely eradicating a number of malicious infectious disease like small pox, rubella, mumps, measles and polio as well as decreasing the burden of diseases like tetanus, measles and diphtheria etc. Vaccination has been the hallmark of disease control for hundreds of years since it was first tested by English physician Edward Jenner in 1796 and further validated by Louis Pasteur through their work on smallpox vaccine. 
Vaccines function by imitating an infectious agent, and by doing so, train our bodies to respond more rapidly and effectively against them. They are either a toxin or surface protein that is identical to the offending microorganism and are made from a killed or inactivated part of the pathogen. By injecting this agent our body achieves a crash course in recognizing the agent as a threat, enabling the immune system to combat the pathogen, destroy them, and lastly, protect our bodies from a future encounter.