Pune-based Serum Institute of India on Monday expressed hope at the possibility of Covid-19 vaccine - Covishield receiving the regulatory approval in "few days", while emphasising that the company has a massive stockpile 40-50 million doses.

The drug maker has partnered with global pharma giant AstraZeneca and the Oxford University for making the vaccine and is conducting trials in India. Indian drug regulatory body is looking at the UK's approval to this vaccine before giving nod for Emergency Use Authorization to its Indian counterpart developed by SII.