It seems that the incubation period of the corona infection was accelerated by the delta mutation, followed by the check-up and pressure-type K quarantine, which made the follow-up investigation ineffective.
According to the results of the study of delta mutation analysis by researcher Lu Jing of the Chinese Center for Disease Control and Prevention, the incubation period was increased to 4 days, and the proliferated virus was 1200 times higher, Nature reported on the 21st.
Delta mutation infected persons multiply faster than the existing incubation period of more than 6 days and generate more viruses, thereby strengthening the transmission power, and Korea is tied to the epidemiological investigation, diagnostic test and quarantine system tailored to the existing incubation period of one week, so even in the fourth stage of distancing, infection in the metropolitan area doesn't seem to decrease.
The daily average of 953 confirmed cases of corona in the metropolitan area after Stage 4 (18th-22nd), and 961.8 people on the 11th to 15th before the previous day, the distance head is the same even after the sudden increase in the second stage.
On the 21st, Lee Ki-il, 1st Supervisor (Health and Medical Policy Office), said, "It is the tenth day of the fourth-level upgrade. At first, I thought that the effect would appear in about a week at the earliest, but the effect is not showing yet. He said, "Tomorrow, patients from the Cheonghae Unit will be added, so it is expected that the patients will probably be given on Friday or Saturday."
Park Young-joon, head of the Epidemiological Investigation Team, Bang Dae-bon, said in a briefing on the same day, "We expect about two weeks before the effect appears when the amount of movement is reduced due to social distancing." There are two things that increase the amount of movement.
On the 22nd, Sohn Young-rae, head of social strategy division, said, "It is still too early to see whether the new distancing system has had sufficient quarantine effect, so it is a bit difficult to judge." He said, "We are watching the changes in the epidemic situation in the metropolitan area day by day." The current goal is to reverse the trend in the metropolitan area.”
The quarantine policy dominated by preventive medicine excludes virus medical experts and infectious disease specialists, and partly participates in the “Lifestyle Prevention Committee,” an advisory body that has no decision-making authority.