Karnataka awaits revised fact sheet to increase Covaxin usage Updated: Updated: The vaccine has been used only on healthcare workers so far. Share Article AAA The vaccine has been used only on healthcare workers so far. Armed with the Phase 3 results of Covaxin that have shown an interim vaccine efficacy of 81%, the Health Department is waiting for a revised fact sheet from the Drugs Controller General of India (DCGI) to increase the usage of this vaccine across the State. As of now, Karnataka has utilised just 9,008 (2.5%) of the total 3,56,340 doses of Covaxin it has received. With a shelf life of six months, this stock is set to expire in May. Given this, the Health Department is now working on increasing its usage. There has been a huge demand for vaccination since the second phase was rolled out.