Health authorities in China's northwest city of Xi'an are still struggling to establish a clear train of transmission for the latest cluster of COVID cases, which has led to a citywide lockdown of almost 13 million residents and drawn criticism of its pandemic response.
Caixin
China's Xi'an struggles to figure out how COVID swept through city
Second provincial capital with full lockdown in year has nearly 1,000 cases so far
Workers stand at an entrance to a university's residential area under lockdown on Dec. 20 following the COVID-19 outbreak in Xi'an, China. © Reuters
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