So far, the biggest reason health authorities are worried about, is that the number of cases in which the infection process cannot be understood is that it is increasing, rather than decreasing.

It now accounts for nearly 25% of all confirmed cases.

Since there are no symptoms, so the so-called quiet radio waves transmitted while active while not being felt are especially scary.

This is reporter Kim Hye-min.

<Reporter> There

were 22 confirmed cases at the Seoul Pogyo Center in Yeongdeungpo-gu, Seoul, and an additional one was confirmed today (12th).

Four more people were at the day care center in Icheon-si, Gyeonggi Province, and nine more were infected in the K health industry in Gangnam-gu.

Regarding the Liberation Day urban rally, one additional person was added during the investigation, resulting in a total of 565 confirmed cases.

Although the number of confirmed cases in Severance Hospital in Seodaemun-gu, Seoul did not increase, the number of related confirmed cases increased to 23, with two additional confirmed cases.

However, all 854 people, including patients and guardians who were served by a confirmed cook, were negative.

Sporadic group infection continues even outside the metropolitan area.

Three people were confirmed at the Daejeon health food briefing session, one at the Serving Nursing Home in Geumsan-gun, Chungcheongnam-do, and seven people were confirmed to be infected one after another at the Sanyangsam business presentation in Chilgok-gun, Gyeongbuk.

As sporadic group infections continue throughout the country, 23.4% of all confirmed cases with unknown infection routes in the last two weeks.

[Park Neung-hoo/Minister of Health and Welfare: Cases of unknown infection route are accumulating day by day.

As the quiet spread continues, regional infection continues.] The

quarantine authorities said that it is a situation where anyone can be infected at any time, and asked to follow guidelines to keep away from confined, dense, and intimate environments in daily life.

(Video editing: Kim Jun-hee)