Vaccine : - A substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease. Vaccine development strategies in case of viral infection Basically, there are three approaches that we take for vaccine development: - 1) Traditional Approach 2) Reverse vaccinology Approach 3) Structural vaccinology Approach So, we will discuss them one by one: - 1) Traditional Approach : - This approach generally includes the traditional methods that is the introduction of attenuated or inactivated infectious agent into the body of a person which helps the immune system to have acquired knowledge about the agent/antigen, so that any further introduction of that antigen into the...