vaccines for Covid-19 -- Oxford's Covishield, which is being developed by the Pune-based Serum Institute of India, and Bharat Biotech's Covaxin -- the state governments across the nation are waiting for instructions from the Central Government on when to start the vaccination drive.As many as 30 crore frontline workers are expected to get the Covid-19 vaccine dose in the first phase.The health officials of the state governments have said that in the second phase those above 50 years of age and with co-morbidities would be given a vaccine against the novel coronavirus.To prepare for the Covid vaccination drive, the health authorities have said that the data of frontline workers have been updated on the Central Government's portal.Various.