Xinhua News Agency, Wuhan, June 2nd (Reporters Tan Yuanbin and Yu Jue) The concentrated nucleic acid test carried out in Wuhan found 300 asymptomatic infected persons. Lu Zuxun, chairman of the Chinese Society of Preventive Medicine's Social Medicine Branch and professor of the School of Public Health at Tongji Medical College of Huazhong University of Science and Technology, said on the afternoon of the 2nd that no asymptomatic infections were found to be infectious.

　　At the press conference held by the Hubei Provincial Epidemic Prevention and Control Headquarters on the same day, Lu Zuxun introduced that Wuhan’s concentrated nucleic acid test detected a total of nearly 9.9 million people, of which asymptomatic infections accounted for only 0.303/10,000, of which 300 people No case was referred for diagnosis. Tracking 1174 close contacts, the results of nucleic acid tests were negative.

　　He disclosed that since April 26, the Wuhan Center for Disease Control has taken sputum and pharyngeal swab samples from 106 asymptomatic patients and sent them to the Wuhan Institute of Virology, Chinese Academy of Sciences and the Hubei Provincial Center for Disease Control for virus isolation, culture and sequencing analysis No "live virus" was cultivated.

　　At the same time, since May 14, the Wuhan Center for Disease Control has sampled the homes and living environments of 300 asymptomatic patients. Collected wipe samples of masks, drinking glasses, toothbrushes, mobile phones and floors, furniture, door handles, toilets, floor drains, etc. used by asymptomatic infected persons, and collected some wipe samples of elevator keys, corridor items, etc., a total of 3343 samples, test results All are negative.

　　In addition, since May 14th, Wuhan CDC conducted serum antibody tests on 300 asymptomatic infected persons. The results showed that there were 187 IgG single positives, 3 IgG and IgM double positives, and 110 IgG and IgM double negatives. Prompted by the recent infection of IgM Danyang.

　　Lu Zunxun said: "Wuhan invited experts including academician Li Lanjuan to analyze and judge the data of the centralized nucleic acid detection and investigation. Based on the investigation, no cases of asymptomatic infections infecting others and the above data have been found. People with asymptomatic infections are contagious."