Bharat Biotech chief Dr Ella on vaccine efficacy controversy

The vaccine produced by Hyderabad-based Bharat Biotech in collaboration with the Indian Council of Medical Research (ICMR) and National Institute of Virology, Pune, has courted many controversies since it began its first human trials. In this video, Bharat Biotech chief Dr Krishna Ella talks to Business Today Editor, Rajeev Dubey, about vaccine efficacy and why people get suspicious about Indian companies.