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Health authorities emphasize the speed war every day. If you can't find it in a short time, you don't know how much it will spread. As soon as possible, I used the information of cell phone base stations around the Itaewon Club to send text messages to about 10,000 people to be inspected and secured CCTV data.

Reporter Nam Joo-hyun continues.

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Every day from midnight to 5 am every day from the 24th to the 6th of last month, there are 1,905 people who stayed in the Itaewon nightlife area for more than 30 minutes.

Based on the access history of the base stations of the mobile carrier, the city of Seoul sent text messages to them to be tested for Corona19.

[Park Won-soon / mayor: If you judge did not have a club in or around As will be no need receive (check), and bateusyeoseo'd better fully confirmed (we recommended)]

under inspection to ensure even 494 people names using the card at the club five Self-containment measures were taken.

Of the more than 5,500 people on the club's visitor list, about 2,000 still remain out of reach.

Health authorities are looking for club visitors with the help of mobile carriers, police, and card companies because it is important to quickly diagnose them.

[Kwon Joon-Wook / National Health Research Institute: If you track and find more than 90% of the contacts in the shortest possible time, you can eventually suppress them. So, because it's a fight against time ... .]

So far, there have been 1,300 diagnostic tests involving Itaewon clubs across the country.

To encourage prosecutors, the health authorities are trying to expand the 'anonymous prosecutors' that can be tested without a real name, and secure a list in the same way for club maids who have first confirmed.

The police are also securing CCTV data in the Itaewon area to prepare for further epidemiological investigations.