Phase 3 human trials of a Covid vaccine candidate were launched in Karnataka on December 2. Chief Minister BS Yediyurappa virtually inaugurated the trials of Bharat Biotech's Covaxin on the same day that the United Kingdom cleared the Pfizer-BioNTech vaccine for use. Its doses are likely to be available in UK from next week. Many other states are currently conducting phase 3 trials of Covaxin, which was indigenously developed in India. Watch the full video for more.