NEW DELHI, March 21 -- The Union government has placed orders for 120 million more doses of coronavirus vaccines with Serum Institute of India (SII) and Bharat Biotech, moving to secure more stocks at a time when officials and experts are calling for speedier delivery as a new wave of infections takes holds in several parts of the country. Of the 120 million doses, 100 million will be of Covishield and the remaining of Covaxin. The vaccines are being purchased at a reduced cost of Rs.150 per dose from an earlier Rs.210 per dose. P2...