At the press conference on epidemic prevention and control work in Shanghai held this morning (19th), Hu Xiaobo, director of Shanghai Clinical Laboratory Center, discussed the daily nucleic acid test in the closed area of Shanghai in recent days. The need for testing is explained. Hu Xiaobo said that for the “continuous screening” that everyone is concerned about, there is a rule of disease occurrence and development and detection technology: The new coronavirus has an incubation period after infecting the human body, and the incubation period , the virus content is not high, when the sample was collected, the amount of virus collected was also small, and the detection limit of the detection method was not reached during the test, and the result seen at this time may be a negative result. When the virus continuously grows and replicates in the body, after reaching a certain amount, the virus content in the specimen is also high, reaching or exceeding the detection limit of the detection method, then you can see Until the positive result came out. Of course, different individuals have different incubation periods, which are closely related to each person’s body’s immunity; the test results are also related to the sampling method and testing technology. When the community completes a round of nucleic acid screening, usually those infected with higher viral loads can be screened, but some infected individuals with lower viral loads will show negative nucleic acid results. When these patients or infected people have more and more virus replication in their bodies, they can be found through testing. The latter, if not detected in time, may become potential communicators in this community. Therefore, it is necessary to dynamically detect positive infected persons as soon as possible through multiple rounds of nucleic acid screening in a row, and realize the “dynamic clearing” of the society as soon as possible.
(Source: CCTV News Client)
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