China's "dynamic clearance" approach means it aims to clear all cases, and all people who test positive are sent to central quarantine centres or hospitals. Close contacts and neighbours must quarantine at home.
Many across the city have taken to social media to vent their frustrations in lockdown, posting videos and images of crowded quarantine centres and also issuing calls for help with medical treatment and purchasing food.
Business life has also been seriously disrupted.
The lockdown has roiled auto production in the city and Chinese firms have halted a wave of planned domestic initial public offerings, filings show, as the current case surge has hampered due diligence and information gathering - affecting an estimated $9 billion-plus in fundraising.
Across mainland China, the daily numbers of new local infections in the past two weeks were much higher than those seen in the first two months this year, marking the biggest wave since the 2020 surge centred on Wuhan. The eastern city of Xuzhou, which reported a total of less than 20 local infections in the past week, has imposed a three-day lockdown in most areas starting Wednesday.