India's drug regulator has granted emergency use approval for Zydus Cadila's Covid-19 vaccine, the world's first DNA shot against the coronavirus, in adults and children aged 12 years and above. <br /> <br />The vaccine, ZyCoV-D, uses a section of genetic material from the virus that gives instructions as either DNA or RNA to make the specific protein that the immune system recognises and responds to. <br /> <br />Unlike most Covid-19 vaccines, which need two doses or even a single dose, ZyCoV-D is administered in three doses.
