Drug Controller General of India (DCGI) V.G. Somani on Sunday approved Serum Institute of India\'s \'Covishield\' vaccine and Bharat Biotech\'s \'Covaxin\' for emergency use, paving way for its roll-out and administration to millions.<br /><br />Covishield and Covaxin have to be administered in two doses and can be stored at

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