The big question in the minds of many - is the third wave of Covid 19 in India just around the corner? What should be our vaccination targets - and what has been learnt to make us better prepared for future pandemics. NDTV's Maya Sharma spoke to Infosys Co-founder S Gopalakrishnan and Dr. Gagandeep Kang, Professor of Microbiology at CMC, Vellore on the challenges due to COVID-19.