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Jung Eun-kyung, head of the Korea Centers for Disease Control and Prevention (KCDC), said, "I think the epidemic will progress slowly until September and then gradually break down (after that)." In response, he revealed the sustainability of the 4th stage quarantine in response to the pandemic until the end of September. Commissioner Jeong said, "It is necessary to raise the (1st) vaccination ra..

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..