The ambitious Phase 3 vaccination drive in the country amid the raging second wave of Covid-19 across states is most likely to hit on May 1 when it is scheduled to begin with vaccination for all adults above 18 years. <br /> <br />Several state governments have said they won't be able to start the vaccination drive for all adults from May 1 due to a shortage in vaccine doses. Those states are Delhi, Bihar, Gujarat, Chhattisgarh, Punjab, Rajasthan, Himachal Pradesh and Maharashtra, even Uttar Pradesh also said no stock for phase 3 vaccination.