The vaccination of those between 18 and 44 will not start on May 1 (Saturday) in Mumbai because of the shortage of Covid jabs, a top official said today in tweets. "Vaccination for the new age group will start only after enough vaccines are made available, and not exactly on 1st May," tweeted Ashwini Bhide, Additional Municipal Commissioner in Mumbai's civic body BMC (Brihanmumbai Municipal Corporation).