China’s strict 21 day quarantine under question after new outbreak emerges

A man who completed 21 days of mandatory quarantine upon returning to China from overseas has been identified as the likely source of a new outbreak, raising questions over the sustainability of the country’s stringent zero-Covid strategy.

The fresh outbreak in Fujian province on China’s southeastern coast has infected more than 60 people, including 15 elementary school pupils. It emerged just two weeks after China contained its worst coronavirus flareup in more than a year, highlighting the increasing challenge posed by the highly contagious Delta variant — even to a country with some of the world’s strictest, most far-reaching containment measures. The latest infections were first detected in two young brothers during a routine Covid test at a elementary school in Xianyou county, Putian city, on Thursday. Another student and three parents tested positive the next day, the Putian municipal government said at a press conference Friday.

Experts advising the government have pointed to one of the parents — a father who recently returned from Singapore — as the likely source of the outbreak, despite the man having completed a lengthy quarantine on arrival in China. The man arrived in Xiamen, a major coastal hub in Fujian, on August 4, where he underwent 14 days of compulsory hotel quarantine. He spent another 7 days in centralized quarantine at a designated location in Xianyou, before returning home for a further week of health monitoring, according to the Putian government.

He had tested negative for the virus nine times during 21 days of quarantine, before testing positive on Friday — 37 days after entering China, according to state media. China’s border restrictions and mandatory quarantine requirements for overseas arrivals are among the strictest in the world. Since containing the initial outbreak in Wuhan, the Chinese government has blamed every local flareup on transmission from abroad — either through travelers or imported goods. Chinese authorities did not reveal when, where or how the man caught the virus, but an incubation period longer than 21 days is highly unusual.

Researchers at the Guangdong Provincial Center for Disease Control and Prevention found that the Delta variant has an average incubation period of 4 days, compared with an average of 6 days for the original strain. Some have questioned on social media if the man picked up the virus after he returned to Xianyou. As of Sunday afternoon, Putian had reported 32 confirmed cases and 32 asymptomatic infections, according to the Putian government. China keeps a separate count of symptomatic and asymptomatic cases and does not include asymptomatic carriers of the virus in the official tally of confirmed cases.

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