Resident doctors at one of Delhi's biggest healthcare hubs, the Ram Manohar Lohia Hospital, today demanded they be administered Covishield vaccine and not Covaxin since the former has completed all three stages of trials as required under protocol. The second one, produced by Hyderabad-based Bharat Biotech, is still only undergoing stage-III trials. The central government has, however, sought to underplay such apprehensions saying "a lot of work" had gone into the development of both products.