Chief Executive Officer of Serum Institute of India (SII), Adar Poonawalla, on Thursday said the vaccine manufacturer stopped the production of Covishield vaccine starting December 2021, and of the total stock available at that time, around 100 million doses had already got expired.

Speaking to reporters on the sidelines of the annual general meeting of Developing Countries Vaccine Manufacturers Network (DCVMN), he said booster vaccines have no demand as there is general lethargy among people and also because they are fed up with the pandemic.