Why is a wholesale market in Beijing linked to new coronavirus cluster?

Beijing's Xinfadi market has been caught in the spotlight after a new coronavirus cluster was linked to the capital's largest vegetable wholesale market.  

An epidemiological investigation has found that dozens of locally transmitted cases reported in Beijing from June 11 to 13 had some exposure history to the market, which was closed on Saturday. Lockdowns have been imposed in 11 nearby communities. 

Before this development, Beijing had recorded zero COVID-19 cases for 56 consecutive days, according to local authorities. 

So, why has the market become the latest source of new cluster infections? Wu Zunyou, chief epidemiologist at the Chinese Center for Disease Control and Prevention, addressed the pressing questions in an interview with a reporter from China's National Supervisory Commission.  

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