An aerial view of the construction site of the quarantine camp in Shijiazhuang, Hebei, China, on January 19.
CNN  — 

China is rushing to build a massive quarantine camp that can house more than 4,000 people, after an outbreak of Covid-19 this month that has left tens of millions of people under strict lockdown.

The quarantine camp is located on the outskirts of Shijiazhuang, the provincial capital of Hebei province, which surrounds the country’s capital, Beijing.

China has largely contained the spread of the virus, with much of the country returning to normal. However, a sudden rise in cases has alarmed officials and raised concerns ahead of the Lunar New Year, the county’s most important annual festival, during which hundreds of millions of people are expected to travel to visit family members.

Officials in Shijiazhuang, where the outbreak is centered, have initiated mass testing and strict lockdowns, moving entire villages into centralized quarantine facilities in a bid to curb the spread of the virus.

Workers building the quarantine center in Shijiazhuang, Hebei province, China, on January 18.

The new quarantine camp will house close contacts of confirmed Covid-19 patients, as authorities continue an extensive contact tracing and testing program.

It was originally planned to house 3,000 people, but has since been expanded to a capacity of 4,160. More than 4,000 construction workers performed “six days’ and nights’ work” to complete the first phase, said Shijiazhuang Deputy Mayor Meng Xianghong on Tuesday.

Authorities began construction on January 13 and the first section of the camp is now complete and ready for use, while construction continues on the second phase, according to state-owned broadcaster CCTV.

Each prefabricated room is expected to measure 18 square meters (around 194 square feet), and will come with an en-suite bathroom and shower, desks, chairs, beds, Wi-Fi, and a television set, according to CCTV.

The ambitious task is reminiscent of earlier efforts during the initial stages of the pandemic, during which authorities built several medical facilities from scratch, including a 1,000-bed hospital in just 10 days.

On Wednesday, China reported 144 new confirmed cases and 113 asymptomatic infections, which are counted separately. The cases are spread out over at least six provinces.

Hebei province now has a total of 818 active locally transmitted cases, and more than 200 asymptomatic infections, the provincial health commission said on Wednesday.

Last Wednesday, a patient died in Hebei – the country’s first Covid-19 related death in 242 days.

The total number of confirmed Covid-19 cases in mainland China now stands at 88,557, while the official death toll is 4,635.

Citizens line up for the third round of testing in Shijiazhuang on January 18.

In an effort to contain the outbreak, authorities placed Shijiazhuang under lockdown on January 8, with all 11 million residents barred from leaving the city.

More than 20,000 citizens from 12 villages in Shijiangzhuang have since been relocated to other quarantine sites as a preventative measure, Chinese state media outlet CGTN reported last week.

To date, more than 17 million people have been tested in Hebei, with authorities currently undertaking a second round of mass testing in Shijiazhuang and the cities of Xingtai and Langfang.

Hebei authorities are now urging residents to stay at home, with officials sent to urban and rural areas to enforce measures and ensure people aren’t traveling across the province and into Beijing.

Beijing authorities have also stepped up testing and screening efforts after reporting the biggest daily jump in new in more than three weeks, with infections concentrated in Daxing district. Residents in the district are under soft lockdown, and are not allowed to leave the area unless they can provide a negative Covid-19 test within three days, according to local officials.

More than 24,000 residents in the surrounding area have also been asked to stay at home until further notice. Meanwhile, schools citywide have been told to complete in-person learning by Saturday, and university students are being discouraged from leaving Beijing.

In northeastern Jilin province, 102 cases have been linked to a so-called “superspreader,” a salesman who traveled from his home province of Heilongjiang.