what is vaccine? Blog By BalaMurugan A vaccine is a biological preparation that provides active acquired immunity to a particular infectious disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins, or one of its surface proteins. what is the vaccine for covid 19? Pfizer is a new company which founded the vaccine for covid 19 Pfizer Inc. is an American multinational pharmaceutical corporation. One of the world's largest pharmaceutical companies, it is ranked 57 on the 2018 Fortune 500 list of the largest United States corporations by total revenue Now you all think that is it possibe to found vaccine for covid? Pfizer/BioNtech vacci...