NEW DELHI: The key vaccines India is banking on are from Oxford/AstraZeneca, Novavax and J&J and the earliest efficacy data is expected by the end of November-December 2020 and in the best case, vaccines can be rolled out in January 2021. According to a research by Credit Suisse, India needs about 1.7 billion Covid-19 vaccine doses to vaccinate majority of its adult population. It targets to administer 400-500 million doses by July 2021.