> But aren't the new vaccines of a different kind? Genetically engeneered? Only some are (those based on mRNA and DNA). There are many others based on older bi

> But aren't the new vaccines of a different kind? Genetically engeneered? Only some are (those based on mRNA and DNA). There are many others based on older biotech (using inactivated virus) too. I think some of the protein based vaccine, like Novavax, are also older tech than mRNA / DNA based ones, and have been studied longer (someone more experienced can chime in and correct me if I am wrong).