Final Phase-3 results of Covaxin show efficacy of 77.8% against Covid By IANS | 93 Views Final Phase-3 results of Covaxin show efficacy of 77.8% against Covid. Image Source: IANS News New Delhi, July 3 : Efficacy analysis demonstrates Covaxin to be 77.8 per cent effective against symptomatic COVID-19, through evaluation of 130 confirmed cases, with 24 observed in the vaccine group versus 106 in the placebo group. Bharat Biotech has concluded final analysis for Covaxin efficacy from Phase 3 clinical trials. Efficacy analysis demonstrates Covaxin to be 93.4 per cent effective against severe symptomatic COVID-19. Safety analysis demonstrates adverse events reported were similar to placebo, with 12 per cent of subjects experiencing commonly known side effects and less than 0.5 per cent of subjects feeling serious adverse events.