China is racing to build a quarantine center to house 4,000 people in the northern city of Shijiazhuang, the epicenter of the country’s latest outbreak of the coronavirus, which Beijing has largely contained at an enormous cost to its 1.3 billion people. While much of the world is reporting record numbers of infections, hospitalizations, deaths and disruptions related to the coronavirus, China, the original site of the virus, has avoided a massive resurgence alongside overseeing an economic revival. But it has done so by mandating mass surveillance and periodic lockdowns of entire cities and towns at the first report of new cases.

Despite these efforts, cases of the virus continue to pop up. China has recorded over 100 daily new cases for the past seven days, marking its worst domestic outbreak since March, according to Reuters. At least 11 regions in three Chinese provinces are on lockdown, China’s state-owned Global Times reported Monday. The government is on edge ahead of the Lunar New Year in mid-February, when millions of people in China typically travel to celebrate with friends and family.

This time last year, reports of a mysterious pneumonia-like virus circulating in Wuhan, China, were raising alarms across Asia. Then on Jan. 23, China ordered a massive, months-long lockdown of 11 million people in Wuhan and the greater Hubei province. In those early days, Chinese workers rushed to build massive quarantine centers and field hospitals alongside implementing mass testing and surveillance measures.