Insight Covaxin approved for Phase 2 & 3 Trials on 2-18 year-olds Dhirendra Behera May 12, 2021 Hyderabad-based Bharat Biotech has been granted permission to conduct the phase 2 and phase 3 clinical trials of its COVID-19 vaccine ‘Covaxin’ on children between the 2 to age 18.