Shanghai began implementing a three-zone epidemic control system on Monday that categorizes communities based on the level of COVID-19 infections, which will allow some residents restricted movement.

The city, which has been under lockdown, released a list of more than 17,600 communities based on the latest citywide nucleic acid test results that were available on Monday morning. The list will continue to be updated in accordance with the categorized epidemic control system.

Communities were categorized into three types of zones: lockdown (7,624 communities); controlled (2,460); and precautionary zones (7,565). District governments have begun releasing the status of communities via social media platforms such as WeChat.

Lockdown zones refer to neighborhoods that have reported new infections in the previous seven days, and residents are required to stay at home for a week under closed-loop management.

Controlled zones refer to neighborhoods where no infections were reported in the previous week. Residents are allowed to retrieve food deliveries or take a walk at designated spots at staggered hours within the compound.

Precautionary zones are communities that have not reported infections over the past 14 days. Residents can leave their neighborhood but must stay within their subdistrict, and they are encouraged to limit their movement.

Gu Honghui, deputy secretary-general of the Shanghai municipal government, said the categorization list is subject to changes based on infection situations in communities, and the government will update and publish it regularly.

"Our principle, as always, is to strive to minimize the impact of the epidemic on residents' daily lives," he said at the daily briefing on the city's epidemic control situation.

As the spread of the virus through the city is still at a high level, residents in precautionary zones are also advised to avoid unnecessary activities outside their homes and to continue working remotely, Gu said.