More than 70 per cent of COVID-19 patients over 40 years of age in both the waves and older population continues to be more vulnerable to the infection, the Centre said on Monday.

Addressing media, ICMR Director General Balram Bhargava said there is no difference in deaths between first and second wave among hospitalised patients, while the oxygen requirement is higher in second wave and ventilator requirement is not higher in the second wave.