Chinanews client April 2 (Song Yusheng) On April 2, Academician Zhong Nanshan of the Chinese Academy of Engineering participated in the Xinguan Epidemic Prevention and Control International Sharing Conference remotely via video. During this time, Zhong Nanshan delivered a full English speech. He said that due to the contagious nature, we should pay more attention to two types of asymptomatic infections, including close contacts of patients with new coronary pneumonia and personnel from key epidemic areas.