DNA-based Vaccines Subject – Science and Tech Context – Zycov­D, first vaccine for those above 12, gets nod. It is also the only DNA based vaccine in the world and can be administered without a needle, purportedly minimising chances of reactions. Concept – Viral vector-based vaccines differ from most conventional vaccines in that they don’t actually contain antigens, but rather use the body’s own cells to produce them. They do this by using a modified virus (the vector) […]