Vaccine Must Have At Least 50% Efficacy For Wide Use: Drug Authority

The Drugs Controller General of India (DCGI) has issued a new set of guidelines, focusing on safety, immunogenicity and efficacy parameters for pharma giants who are developing COVID-19 vaccines.

source https://www.ndtv.com/india-news/new-guidelines-issued-for-pharma-giants-manufacturing-covid-vaccine-2299623