Shanghai published plans to resume production in the city after weeks of COVID-19 lockdown snarled supply chains and dealt a blow to the Chinese economy.

Businesses should formulate plans for closed-loop management, where workers live on-site and are tested regularly. They should also apply for approval to restart production with Covid control authorities at the district and city levels, Shanghai’s Economic and Information Technology Commission said in a statement on its WeChat account. The agency did not provide a timetable of work resumption.

The lockdown in China’s financial hub, now in its third week, has squeezed everything from consumer spending to logistics and production. The key to addressing the economic woes is adjusting China’s “COVID-zero” policy, analysts said, as the Chinese central bank takes a cautious approach with monetary easing. But top officials have repeatedly warned about risks to growth and the need for more monetary and fiscal stimulus.

Shanghai is a production base for many companies, including Tesla Inc. and China’s state-owned SAIC Corp. Tesla is calling back its workers in the city to prepare for the initial resumption of production as soon as next week, Bloomberg has reported.

Under the new work resumption plan, different areas of factories must be separated, and all staffers should work and live in designated locations, reducing direct contact with people in other areas as much as possible, according to the statement.

Visitors will be tightly restricted, and company truck drivers must provide negative nucleic acid test results within 48 hours or negative antigen test within 24 hours before entry, it said. Makeshift hospitals should be set up at firms with a large number of workers, it added.