TOI image used for representationNEW DELHI: The Union health ministry on Sunday listed parameters such as active Covid-19 cases, doubling and fatality rates and cases per lakh population, for states and union territories to follow while categorising areas into red, orange or green zones. It also issued guidelines for delineation of containment and buffer zones and outlined actions that have to be implemented in those areas to break the chain of transmission of the disease. In a letter to the states and union territories, Union Health Secretary Preeti Sudan said states may categorise districts or municipal corporations into hotspots, red, orange and green zones. They, however, may also choose to categorise sub-division, ward or any other appropriate administrative unit into the colour-coded zones after detailed analysis at their end, duly taking into consideration the geographical spread of cases, contacts and their zone of influence in terms of the disease spread, the letter said. This comes after the ministry of home
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