MUMBAI: The civic body is likely to use an Interactive Voice Response (IVR) system to reach those overdue for their second vaccine shot. As on Thursday, the city had 4.73lakh beneficiaries who have completed the necessary interval to be eligible for a final dose. A civic official said the IVR services of BSNL may be used to reach out to them. The civic body has already downloaded names and handed them over to ward war rooms. The sheer numbers could mean the teams would take a while to reach everyone. "Through IVR, people will get calls and they simply have to press 1 or 2 if they have been vaccinated with the first or both doses. The automated system can reach 4-5lakh in a matter of a few days. The ward war room efforts will continue too," the official said. Additional municipal commissioner Suresh Kakani said there are four possible groups: those who have taken a second shot under a different number, those who took a first shot in Mumbai and the second elsewhere, numbers that are not reachable, and finally, people willing but haven’t had time to take it.