Why Is the Seemingly Solid 50·5·80... Living Quarantine Line Shaking?

Scale of New Confirmed Cases, Undetected Patients, and Proportion Managed Within the Quarantine Network
Partial Conditions Presented for Maintaining the Living Quarantine System
New Cases Increased to 40-50 per Day This Month
Unidentified Infection Routes and Management Proportion Have Not Been Met for Several Days

On the 10th, medical staff wearing 'Level D' protective gear (full-body protective suits, gloves, goggles, medical masks, shoe covers, etc.) at Konyang University Hospital in Seo-gu, Daejeon, are inspecting the status of equipment related to the novel coronavirus infection (COVID-19) tests.

[Asia Economy Reporter Choi Dae-yeol] Under 50, within 5%, over 80%. These are the criteria the government announced when it ended 'social distancing' and shifted to 'distancing in daily life,' the so-called living quarantine system, in early last month. The living quarantine was established with the intention of harmonizing daily life and quarantine by applying somewhat looser standards, considering that the previous distancing measures imposed significant restrictions on daily life and caused considerable side effects.

The aforementioned criteria were calculated considering the capacity of the domestic medical system. The number of new daily confirmed cases of COVID-19 should be less than 50, and the proportion of so-called 'undetected patients,' whose infection routes are unknown, should fall below 5%. The management proportion within the quarantine network refers to the percentage of confirmed cases among those whom authorities consider highly likely to be infected?such as contacts of confirmed cases or incoming travelers from abroad?and are under monitoring.

Separately, the number of newly occurring cluster infections is also considered. This is not based on a specific point in time but calculated over a period of about two weeks to observe trends. The risk level assessed by the quarantine authorities is based on this figure. Of course, exceeding these numerical criteria does not mechanically lead to strengthening distancing measures. The authorities also consider qualitative evaluations unique to them when determining the level of distancing.

When the decision to switch to living quarantine was made in early last month, these figures were not bad. Until the early part of last month, there were even several days with no locally transmitted cases excluding imported cases. However, soon after, major cluster infections occurred, such as the Itaewon club cluster in Seoul and the Bucheon Coupang logistics center cluster, and sporadic cluster infections emerged across the metropolitan area, worsening the situation. This is why the authorities effectively enforced quarantine rules comparable to social distancing, limited to the metropolitan area.

A wheelchair is parked in front of Seongsim Daycare Center in Dobong-gu, Seoul.

When Patients Increase Within a Cluster, the Proportion of Undetected Patients Decreases
It Is Rare for Both the Scale of New Cases and the Proportion of Unknown Infection Sources to Rise Together

The criteria for maintaining living quarantine may seem detailed at first glance, but it is hard to say they are without gaps. Especially when looking at how the figures are calculated, if many patients occur within a specific cluster or if transmission links between clusters are identified, it becomes more likely that the aforementioned criteria will be met. When the number of patients within a particular cluster increases, the denominator used to calculate the proportion of patients with unknown infection routes?that is, the total number of confirmed cases?increases, causing the proportion to decrease. Patients with unknown infection routes count only the first identified index patient regardless of cluster size, while other patients within the same cluster are considered to have known infection routes.

For example, recent small cluster infections at a language institute in Gangnam-gu, Seoul, a call center at an investment company in Gangseo-gu, and churches in Geumcheon-gu and Seongnam-si are reported by the authorities to have spread from the door-to-door sales company Richway located in Gwanak-gu, Seoul. Initially, some cluster infections involved index patients whose infection routes were unknown, but epidemiological investigations confirmed the connection to Richway. Among the 153 patients identified in this cluster from the 2nd to noon on the 13th, only one patient had an unknown infection route, while the rest had identified infection routes.

The authorities' recent negative assessment of the situation in the metropolitan area is partly due to the increasing proportion of elderly patients, raising concerns about fatalities, but also because the likelihood of failing to meet these manageable criteria has increased. Regarding the management proportion within the quarantine network, it was expected that the 80% target could be maintained easily by quickly tracing contacts and isolating or monitoring those at risk, based on experience accumulated over several months; however, this target has not been met for several weeks. The proportion of patients with unknown infection routes has also remained at 8-9% for several days.

There have been calls to strengthen overall social quarantine rules as in March and April, but the government chose to extend the enhanced quarantine rules limited to the metropolitan area as before. While acknowledging the seriousness of the situation in the metropolitan area, the government frankly admitted that returning to the distancing intensification period from a few months ago is difficult. This is due to concerns about the fatigue experienced by the majority of citizens and disruptions to daily life such as studies and work.

This content was produced with the assistance of AI translation services.