USA's top public health regulator - the Food and Drug Administration - has refused emergency use approval to the made-in-India Covaxin vaccine. The FDA has sought more data from Bharat Biotech's American partner, Ocugen. This comes amid reports of Indians who took the Covaxin jab and went to the US, being asked to get 're-vaccinated' with jabs approved in the country. Covaxin is also yet to be cleared by the World Health Organisation (WHO). Watch the full video for more.