Those entering China via Shanghai have been ordered to be put under strict observation for seven days after 14 days of quarantine in designated hotels, the municipal anti-epidemic authority said Monday.

Those with Shanghai as their destination and a fixed residence in the city with only one person or a family have been asked to "not leave their home unless necessary" during the 7-day quarantine.

Others will be transferred to designated hotels for the 7-day observation after being discharged from the 14-day quarantine, the authority said.

Besides temperature checks twice a day, they will undergo COVID-19 tests on the second and seventh day during the week-long observation.

The measures will be effective from Tuesday until March 31.