India's biggest challenge: how to vaccinate 1.3bn people against Covid-19?
https://www.theguardian.com/global-development/2020/dec/08/indias-biggest-challenge-how-to-vaccinate-13bn-people-against-covid-19
https://www.theguardian.com/global-development/2020/dec/08/indias-biggest-challenge-how-to-vaccinate-13bn-people-against-covid-19