Residents line up to be tested for COVID-19 in Qingdao, China, on Monday. STR/AFP via Getty Images

The Chinese city of Qingdao is testing all 9 million of its residents after 12 new coronavirus cases were detected.

Officials found six symptomatic and six asymptomatic cases and traced them to a hospital that tends to treat foreign patients, the state-backed Global Times newspaper reported.

Life in China, where the virus was first detected, is mostly back to normal, but authorities move quickly and test widely when new cases are found.

China also tested the entire city of Wuhan, home to 11 million people, in May, when it was afraid the virus could spike there again.

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China is testing an entire city of 9 million people for the coronavirus after it discovered 12 cases connected to a hospital.

The city of Qingdao found six new COVID-19 cases and another six asymptomatic cases on Sunday and connected them to the Qingdao Chest Hospital, China’s state-backed Global Times newspaper reported.

Officials there are hoping to test the whole city in five days. The hospital is where COVID-19 patients from overseas are treated, according to the Global Times.

Pictures show people lining up in their communities to get the free tests.

Qingdao residents wait to be tested for COVID-19 on Monday. STR/AFP via Getty Images

The Global Times reported that some testing points were open from 7 a.m. to 11 p.m.

About 114,860 people had been tested as of Monday, BBC reported, citing Qingdao’s Municipal Health Commission.

Reuters reported the Qingdao Chest Hospital and the buildings where infected patients live had been locked down to stop the virus from spreading.

China was the first country to report coronavirus cases, with the first major outbreak in Wuhan. But the country has now largely recovered, with life almost back to normal.

Its strategy has involved tracking down contacts of those who test positive and telling them to isolate. Mask-wearing and social distancing are also common.

A health worker takes a swab from a resident to be tested for COVID-19 in Qingdao on Monday. STR/AFP via Getty Images

Qingdao is not the first example of a city-size response to relatively few cases of COVID-19. Officials tested the city of Wuhan, which has 11 million people, in May after a handful of cases were discovered.

China’s confirmed COVID-19 death toll stands at 4,739, while the US, the worst-hit country, has seen more than 214,000 deaths.

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