Shanghai's Disney Resort had to abruptly shut its gates on Halloween following the visit of a woman who subsequently tested positive for Covid-19

The park locked in all visitors and only allowing them to leave - hours later - once they tested negative for the virus.

Several residents in the city have since received fresh stay-at-home orders and mandatory testing notices, as authorities race to trace contacts linked to the woman.

A number of residents said they were notified today that they or their children could not go to work or school if they had visited Disney since Thursday.

They were also ordered to take daily Covid-19 tests for the next three days.

Security guards at the park form a line to break up the crowds
Tourists queue up to leave Shanghai Disney Resort after presenting negative Covid-19 tests

One resident said she was informed that her family might have to go into central quarantine.

Marvis He was among Disney visitors caught up in the resort's lockdown, having flown in from Shenzhen in hopes of enjoying the park's Halloween themed fireworks.

"I feel disappointed, we waited so long in the park ... but we didn't get to see anything and only got to get out at 10pm," she said as she departed the resort.

"We were also cold and hungry," her companion added.

City authorities said the resort was shut after a 31-year-old woman, who had visited the park among other places in recent days, tested positive for the virus.

While much of the world has started to open up, China has vowed to stick to its zero-tolerance approach to Covid-19 with lockdowns and mass testing imposed when even a single case is found.

The policy has been met with growing discontent from the public and businesses, and been blamed for contributing to weak growth.

Rising unease in China's commercial hub comes as the country's daily local case count hit 2,719, a small figure by global standards but its highest level since 17 August.

Tourists queue to receive their Covid-19 test at the park

The count has prompted other cities such as Guangzhou and Dandong to tighten measures, although Zhengzhou unexpectedly eased its quasi-lockdown on its nearly 13 million people,

"For over ten days, we have persevered and fought together, fighting the disease, advancing and retreating together, and working hard together, and finally we are ushering in a large-scale restoration of normal life and production in Zhengzhou," the city's counter-epidemic task force wrote in an online letter to residents.

The current outbreak in Zhengzhou, the capital of Henan province, flared up after the National Day holidays during the first week of October.