Containment operations will be scaled down if no secondary positive case of COVID-19 is reported from a quarantine zone for at least four weeks after the last confirmed test has been isolated and all his contacts have been followed up for 28 days, the Union Health Ministry said. According to the ministry's 'Updated containment plan for large outbreaks COVID-19', a containment operation (large outbreak or cluster) is deemed to be over 28 days from the date the last case in that zone tests negative.

The closing of the surveillance for the clusters could be independent of one another provided there is no geographic continuity between clusters. However, the surveillance will continue for severe acute respiratory infection (SARI) and influenza-like illness (ILI). States shall ensure that all required steps are taken to contain clusters within the large outbreak and chain of transmission is broken, it said.