<Cho Jae-young Choi>

Infectious disease crisis alerts are of four stages: attention, attention, alertness, and seriousness.

Corona 19 On January 8, when the first bequest box in Korea was released, on January 20, when the first examiner came out from the 'interest' stage, it went up to 'caution'.

Since then, patient isolation and immigration tracking have begun.

A week later, the fourth confirmed audience was upgraded to the current 'border' stage.

The most decisive criterion for determining whether the highest level is a "severe" level is whether or not it has spread across the country.

At the critical stage, the Central Disaster Safety Headquarters is established and the chief officer is changed from minister to prime minister.

We will also actively review school closings and public transportation restrictions.

Until now, the 'severe' stage was only once, influenza.

In November 2009, when an average of two swine flu cases occurred in 1,100 schools nationwide, the crisis alert was raised to a severe stage.

(Video Editing: Min-kyu Jeon, CG: Song Kyung-hye, Oh Yu-rim)

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