(Fighting against New Coronary Pneumonia) Expert: The number and detection rate of asymptomatic infections in Hubei continued to decrease
China News Agency, Wuhan, May 18 (Wu Yili) The Hubei Province New Coronavirus Pneumonia Epidemic Prevention and Control Headquarters held a press conference on the 18th. The detection status and infectivity of asymptomatic infected persons in the province were analyzed and answered.
According to reports, as of 24:00 on May 17, Hubei Province has carried out 6,393,436 nucleic acid tests. Among them, from April 1 to April 7, the number of nucleic acid detection in Hubei Province was 272317 person-times, 230 asymptomatic infections were detected, the detection rate of asymptomatic infections was 8.5 / 10,000, and the nucleic acid detection amount in Wuhan was There were 158403 person-times, and 221 persons with asymptomatic infection were detected. The detection rate of asymptomatic infection was 14 / 10,000.
From the release of control of the Lehan-Han Passage from April 8 to May 17, the number of nucleic acid detections in Hubei Province was 4299,000 person-times, and 733 asymptomatic infections were detected. The detection volume was 2642499 person-times, and 707 asymptomatic infections were detected. The detection rate of asymptomatic infections was 2.7 per 10,000.
From May 11th to 17th, the whole province of Hubei carried out a total of 1531121 person-times of nucleic acid detection, with an average of 218732 person-times per day. Wuhan City accounted for about 72.53%. The detection rate of asymptomatic infections is 0.46 / 10,000.
"There are two cases of asymptomatic infections. One is recessive infection, which is relatively infectious. The other is latent period, and the infectious infection before symptoms appear is contagious. At present, most of Hubei Province is asymptomatic. Infected persons belong to the former. "Feng Zijian said that although the scope of nucleic acid screening for key populations in Hubei Province continues to expand and the amount of screening continues to increase, the detection number and detection rate of asymptomatic infected persons continue to decrease, and the effect of epidemic prevention and control has shown Continue to improve.
According to the investigation and analysis of the Wuhan Center for Disease Control, from April 8 to May 13, a total of 665 people with asymptomatic infections were found, of which 6 were converted to confirmed cases. A total of 2508 close contacts were tracked, 2 of whom were converted to asymptomatic infections, with a ratio of 0.8 per thousand. No one was diagnosed. Combined with the serological test results and past symptoms of 659 asymptomatic infected persons, it is judged that 559 of them may be in the recovery period of infection, accounting for 84.8%; 97 persons are judged to be newly latent infections, accounting for 14.7%; 3 cases are unknown . The Wuhan Center for Disease Control also took 55 sputum samples and pharyngeal swab samples of asymptomatic patients from April 26 to 30, and sent them to the Wuhan Institute of Virology, Chinese Academy of Sciences for cultivation of new coronavirus. None of them had produced new coronavirus.
"It can be seen that the current asymptomatic infections in Hubei Province are mostly latent infections. As the denominator of nucleic acid detection increases, the" molecule "of asymptomatic infections shrinks, indicating the residual infection of the virus in the population. And the spread is getting weaker and weaker. "Feng Zijian said. (Finish)