According to the investigation, the source of the virus has been clearly concluded. An infected person eating in a restaurant triggered a huge spread chain. People are more concerned about why it took six days to test him positive, which increased a lot of risks and uncertainties, and the government had to do more screening work for this. But some people focus on the loopholes in the detection work, which is why it took six days to discover this situation. It stands to reason that nucleic acid testing is done almost every day, and this patient is unlikely to miss the net. In fact, the reasons for careful consideration mainly include the following aspects.
First, I didn't do any nucleic acid. The reason why I was found positive after 6 days was because the patient didn't do any nucleic acid test within 6 days. Before the epidemic came back again, Harbin's control work should be in a relatively loose state, and various departments no longer made mandatory requirements for nucleic acid detection, so this patient did not do any nucleic acid before. Of course, it may also be because I didn't go out these days, and I was tested positive just after I went out to do nucleic acid on the sixth day.
Second, the patient has a special constitution. It is possible that this patient did nucleic acid, but it was not found positive at the first time. This is related to many factors, such as the incubation period of the virus, the patient's physique, detection reagents, specimen collection, etc., which will all affect the final detection results. For example, it is obvious that a patient has been infected with COVID-19 virus, but the detection technology failed to screen it out because it is in the early stage of latent. Or there are some problems with the reagents used, which ultimately affect the test results. Although the probability of this kind of thing happening is very small, it cannot be completely ruled out.