key: cord-304345-efic9sqh
authors: Kym, Sungmin
title: Fast Screening Systems for COVID-19
date: 2020-04-14
journal: J Korean Med Sci
DOI: 10.3346/jkms.2020.35.e153
sha: 
doc_id: 304345
cord_uid: efic9sqh

nan

Walk-through (WT) screening is also being tried out. 2 The advantage of the WT system over the DT system is that it has the same benefits of saving time, manpower, and PPE, but in addition, it is available to people who do not drive. But one main shortcoming of the WT system is the costs required in building negative pressured booths (cost of 2.8 to 3 million Korean won per one WT booth). Safe and effective disinfection of the booth is another issue to be counted.

Another screening system, Globe-Wall (GW) system, would have medical testers be stationed inside the negative pressured booths. The testers would collect respiratory specimens from people who stay outside the booth. This system may have some advantages over others in that it would only require a minimal level of PPE for the testers. But the aforementioned issues of booth construction costs and disinfection still exist in this system.

In spite of several issues remaining unsolved at present, these creative new methods for collecting respiratory specimens for COVID-19 tests have achieved great credibility in terms of time saving. However, it is believed that a couple of the issues still need to be addressed more actively in order to prove the systems' merits.

First, there needs to be greater evaluation of the possibility of COVID-19 patients infecting medical personnel and/or other testees in line with them. So far, there has been no report of a proven case of an individual contracting COVID-19 from participating in the fast screening process. And all daily reports of PCR tests on WT system booths have come out negative even though 2 COVID-19 patients have been detected by the WT test system. 2 However, more properly designed evaluations, such as PCR tests on the booth and PPE for the testers immediately after collection of respiratory specimens from already confirmed patients, and their follow up PCR tests after disinfection, are required.

Second, outdoor setup at well-ventilated spaces need to be considered another option for collecting respiratory specimens via COVID-19 tests. In fact, this method is the recommended alternative for pulmonary tuberculosis or pneumonic plague tests' sputum collection when a negative pressured sputum collection booth is not available. 3,4 The outdoor system of respiratory specimen collection has a clear advantage of saving construction costs of negative pressured booths. But the system may not apply for small open spaces that have no sufficient air circulation.

To conclude, safe and fast ways of collecting respiratory specimens are mandatory in cases of widespread outbreak of transmissible respiratory infections such as the current COVID-19. Although the DT, WT, and GW systems have been tried and are gathering creditability, more thorough evaluations of their safety are warranted. Moreover, the outdoor collection system is believed to have potential as another option for respiratory specimen collection of COVID-19 tests.

Drive-through screening center for COVID-19: a safe and efficient screening system against massive community outbreak

Walk-Through screening center for COVID-19: an accessible and efficient screening system in a pandemic situation

Core curriculum on tuberculosis: what the clinician should know

World Health Organization. How to safely collect sputum samples from patients suspected to be infected with pneumonic plaque