Green zones and red zones with strict measures to prevent case importation are also an option. A few countries/regions currently have close-to-zero new cases a

Green zones and red zones with strict measures to prevent case importation are also an option. A few countries/regions currently have close-to-zero new cases and may become green zones where economic and other activities will mostly resume to normal. Measures that have been used include quarantine and follow-up contact tracing.