The third phase of the countrywide Covid-19 vaccination drive begins today. Under this phase, all adults will be able to avail coronavirus vaccines. People aged 18-44 years, will have to book an appointment for the shot at either a government health centre or at a private hospital. People above 45 years can walk-in at any government vaccination centre and get inoculated. All adults can log on to the government’s CoWin or Aarogya Setu apps to register themselves for the vaccine at any government health centre near them.