Under what specific circumstances should I provide negative proof of nucleic acid within 24 hours, 48 hours and 72 hours? Is nucleic acid mixed detection reliable? Will nucleic acid testing become the norm? In response to these public concerns, He Qinghua, the first-level inspector of National Health Commission CDC, stressed at the press conference held by the joint prevention and control mechanism in the State Council on June 9 that nucleic acid detection is the most scientific, effective and important means for early detection of the epidemic. In areas where there is no epidemic situation and no risk of import, nucleic acid detection should not become a normal state.
Set the validity time of nucleic acid authentication by grade.
Recently, Beijing has adjusted the negative nucleic acid certificate for entering public places from 48 hours to 72 hours. Why should the validity period of nucleic acid authentication be adjusted?
"We consider that the average incubation period of COVID-19 mutant virus Omicron is about 3 days, and potential infected people can be found through nucleic acid detection within 72 hours." Li Ang, deputy director of the Beijing Municipal Commission of Health and Wellness, said that on the other hand, it is also to reduce the frequency of nucleic acid testing among residents and minimize the burden of epidemic prevention and control measures on the public and the impact on normal production and living order.
"The formulation of nucleic acid detection strategy needs to delimit the detection range and frequency according to the needs of epidemic prevention and control, and the subjects conduct nucleic acid detection in the order of high risk level." He Qinghua introduced that the specific provisions are: the first nucleic acid screening should be completed within 24 hours in the closed control area, and the first full-time nucleic acid screening should be completed within 48 hours in the control area. People in high-risk areas, closed control areas and control areas are not allowed to go out, but if it is really necessary to go to low-risk areas and prevention areas where the epidemic occurs, a 48-hour negative nucleic acid test certificate is required. All localities can adjust according to the needs of epidemic prevention and control.
Strict testing standards
A number of nucleic acid testing laboratories were notified of the existence of false reports, illegal multi-tube mixed inspection and other irregularities. So, what is the difference between illegal multi-pipe mixed inspection and conventional mixed inspection? How accurate are the two?
Li, deputy director of the Clinical Laboratory Center of the National Health and Wellness Committee, said that nucleic acid detection is a mature and internationally accepted laboratory diagnostic method with methodological specificity of 100%, which is the "gold standard" for diagnosis.
"At present, five, 10 or 20 sampling swabs are put in a sampling tube for testing. The method has been verified in theory, laboratory and field, which proves that there is no obvious difference between mixed sampling and single sampling, and it is accurate and reliable. Li said that illegal mixed inspection means that the laboratory replaces 10 mixed samples with 30 and 50 samples for further dilution, which risks missing positive results.
Li Ang introduced that in order to ensure the quality and safety of nucleic acid detection, Beijing has carried out flight inspection and key supervision on detection institutions with short establishment time, many quality problems and abnormal monitoring data of information systems. In the past two weeks, 622 times of supervision and inspection have been carried out on third-party testing laboratories, and measures have been taken to cancel the qualification of nucleic acid testing, suspend service and rectify the laboratories with problems, and inform the society in time.
Classification setting detection frequency
"nucleic acid detection is an important means to quickly find infected people, lock in the scope and objectives of control, take measures such as isolation as soon as possible, and cut off the route of transmission." Guo Yanhong, inspector of the Medical Administration and Hospital Authority of the National Health and Wellness Committee, said that in order to control the epidemic earlier and faster, we should adhere to the expanded prevention strategy centered on nucleic acid detection.
"At present, the domestic epidemic situation is generally maintained at a low level, and low-risk people such as low-risk areas and long-term homes do not need frequent nucleic acid testing. The focus of nucleic acid testing should be on high-risk groups and staff in high-risk positions, as well as areas with epidemics. " He Qinghua added.
In view of the recent situation that some epidemic prevention and control areas take compulsory measures such as fines and detention for those who do not take part in the normalized nucleic acid testing, He Qinghua said that the epidemic areas should organize the nucleic acid testing according to the local epidemic situation and the needs of prevention and control, and the joint prevention and control mechanism of the State Council will require the relevant places to promptly rectify the areas, units and individuals that take illegal compulsory measures.