Scenes of homes and buildings in China's most populous city being caged to prevent residents leaving have grabbed global headlines in recent weeks at a time when most other major cities in the world are learning to live with coronavirus.
Some residents, who have been cooped up at home for more than a month, leading to anger and frustration, have struggled to find food and other daily necessities, and shown rare public opposition to the government's stringent controls.
But if the campaign works, it would mark a victory for Chinese President Xi Jinping's zero-tolerance approach to COVID-19 in a year when he is expected to secure a precedent-breaking third leadership term.
Although Shanghai city officials did not discuss the milestone at their daily news conference on Saturday, it was cheered on Chinese social media, with the topic "Shanghai sees zero-COVID transmission at the community level" receiving more than 190,000 views on Saturday morning on the Weibo platform.
Zero cases outside quarantine areas in Shanghai on Friday compared with 108 on Thursday. Other Chinese cities under lockdown began easing curbs after halting transmission outside quarantine areas.
But some cast doubt over the milestone, noting that most of Shanghai's residents were locked in some form of quarantine.
On Saturday, health authorities said there were close to 16,000 sealed-off areas in Shanghai, with more than four million people prevented from leaving their homes. A further 5.4 million people were blocked from leaving their compounds.
The battle to curb the highly transmissible Omicron variant in Shanghai has come at a cost for the economy, businesses and people, while delivery companies have been overwhelmed and logistic chains gummed up by the restrictions.
Infections in the world's most populous country are easing as it enters the April 30-May 4 Labour Day break, traditionally one of China's busiest tourist seasons, but which is taking a huge hit this year due to the virus.
In the capital, Beijing, authorities are racing to detect COVID cases and isolate those who have been in contact with infected people.
Shanghai recorded 47 new COVID-19 deaths on April 29, down from 52 a day earlier.
Beijing reported 48 new symptomatic COVID-19 cases for April 29, compared with 47 cases a day earlier. The city also recorded six asymptomatic cases for April 29, versus two a day earlier.
Mainland China reported 10,793 new COVID-19 cases on April 29, down from 15,688 new cases a day earlier, the National Health Commission said on Saturday.
