At the March 24 press conference of the joint prevention and control mechanism of the State Council, Wu Zunyou, a research fellow of Chinese Center for Disease Prevention and Control, said that China has established three defense lines: ports of entry, quarantine upon arrival, and timely medical treatment for patients showing suspected symptoms, to mitigate the risk of imported cases.
Considering that all the imported cases have been spotted and corralled at the first and second defense lines, with none bypassing them to the third, he believed the three-level defense system is strong enough to prevent the import of infections from causing the second wave of COVID-19 in China.
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