China released a white paper titled "Fighting COVID-19: China in Action" on Sunday. It explains China's efforts and experience in the battle against the disease. But there was also criticism over China's response. For example, some say it took China too long to determine the virus could be transmitted from person to person. Is the accusation legitimate? Liu Xin talked to Dr. Wu Zunyou, Chief Epidemiologist of the Chinese Center for Disease Control and Prevention.

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