Serum Institute of India CEO Adar Poonawalla on Saturday spoke out about the pressures he was under over the production of COVID-19 vaccines to meet the ever-increasing demand in India as the country battles through a devastating second wave of the coronavirus pandemic. In his first comments since he was provided with 'Y'' category security by the Indian government earlier this week, Mr Poonawalla told 'The Times'' in an interview about receiving aggressive calls from some of the most powerful people in India, demanding supplies of Covishield - the Oxford/AstraZeneca COVID-19 vaccine that the Serum Institute is producing in India.