While the number of COVID-19 positive cases increased by 4,500 in four days, the number of Containment Zones (CZ) in congested areas reduced by 43, as the Brihanmumbai Municipal Corporation (BMC) has combined the zones and sealed entire slum pockets. The number of CZs stands at 649 against 692 on May 14. However, the number of sealed buildings has increased by almost 50 per cent to 1,910.

The number of CZs (manageable and in congested areas) has been increasing as the number of patients is increasing rapidly. On May 9, the number of CZs crossed 2,500, after which the BMC adopted a new system of combining multiple CZs and sealing entire slums for better management. From May 14, the BMC split up the CZs in two parts – CZs (in congested areas) and sealed buildings. On May 14 the CZ number was 692 and the number of sealed buildings was 1,271.