The Chinese city of Wuhan, where the coronavirus was first detected late last year, has tested nearly 10 million people in an unprecedented 19-day campaign to check an entire city.
It identified just 300 positive cases, all of whom had no symptoms. The city found no infections among 1,174 close contacts of the people who tested positive, suggesting they were not spreading it easily to others.
There is no definitive answer yet on the level of risk posed by asymptomatic cases, with anecdotal evidence and studies to date producing conflicting answers. A city official announced Tuesday that the city completed 9.9 million tests from May 14 to June 1. If those tested previously are included, virtually everyone above the age of 5 in the city of 11 million people has been tested, said Li Lanjuan, a member of a National Health Commission expert team.The campaign was launched after a small cluster of cases was found in a residential compound, sparking concern about a possible second wave of infections as Wuhan emerged from a 2 1/2 month lockdown.
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