Explanation:

• As cases of local transmission start surfacing across the country, The Centre has advised a containment plan to the states and UTs. 
• A containment zone has been defined based on the index case / cluster, which will be the designated epicentre, the listing and mapping of contacts, geographical distribution of cases and contacts around the epicentre and the administrative boundaries within urban cities /town/ rural area. 
• The RRT (Rapid Response Team) has been advised to do a listing of cases, contacts and their mapping. This is to help in deciding the perimeter for action. 
• Cluster containment strategy refers to contain the disease within a defined geographic area after early detection, breaking the chain of transmission and preventing its spread to new areas. A buffer zone is an area around the containment zone, where new cases are most likely to appear.