To show the non-inferiority between Sputnik Light Booster vs Covaxin and Covishield as booster in terms of: <br/ >â?¢ Proportion of subjects achieving â?¥2-fold increase in neutralizing antibodies at Day 28 from baselineTimepoint: Day 28 from baseline

To show the non-inferiority between Sputnik Light Booster vs Covaxin and Covishield as booster in terms of: <br/ >â?¢ Proportion of subjects achieving â?¥2-fold increase in neutralizing antibodies at Day 28 from baselineTimepoint: Day 28 from baseline