India to start Covid mix-and-match booster vaccines on Friday

India said on Wednesday that Biological E’s Covid-19 vaccine Corbevax can be administered as a booster dose in people who have taken the country’s other two main shots, Covaxin and AstraZeneca’s Covishield, from Friday.Corbevax will be available to over 18s as precautionary booster six months after a second dose, the health ministry said in an August 8 letter to state authorities.