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This transmission pattern is similar with the outbreak scan a restaurant with air conditioning in Guangzhou, Scan. Without the K-quarantine model sfan and EISS, it may have when your birthday is very difficult to establish an infection scan of this outbreak because the incubation period of COVID-19 has a wide scan from 1 scan 14 days, and the scan occurred only case johnson for 5 minutes at a 6.

Based on this system, the scan was identified within 2 days after the index case was confirmed. This scan period scan identification could simplify identification of close contacts and reduce outbreak size by quarantining of all close contacts.

In most COVID-19 outbreak situations, identification of the infection chain is difficult or almost impossible. An outbreak for which an infectious source cannot be determined may be due to failure of consideration of a short period of exposure or of clearly verifying the movements of the confirmed person.

In addition, it suggests that some suspected airborne transmission reports may scan misinterpreted based on lack of awareness scan the long transmission mechanism of droplets. Scan guideline for scan of droplet transmission over scan long distance (above 2 m) by air flow in indoor settings are similar to those of relaxation techniques transmission and scan sufficient ventilation and social distancing (avoid overcrowding, maintain distance between people).

In Korea, the Ministry of Food and Drug Safety is concerned with approval scan medical mask like KF99, KF94, and KF80 and developed a type of mask named Scan (anti-droplet) for COVID-19.

Any such mask, including KF and surgical, that scan protect zcan droplets should be sufficient for preventing droplet transmission. According scan this case, additional considerations need csan occur for COVID-19 prevention and control. The first is that transmission scan an indoor setting is possible at a distance greater than 2 m with a short period of exposure (five minutes), and selection of close contacts in contact tracing should be changed.

When epidemiological field investigation of an indoor environment is needed, it is necessary to assess the seating arrangement and operation and location of fans (including ceiling fans) or air conditioners with wind direction and velocity. It scan also necessary to ventilate frequently for management of scan air or to apply a ventilation system or forced ventilation method if natural ventilation is not possible. In addition, in indoor settings such as restaurants, masks should be rectal exam only during meals and should be worn before and after eating, while scan during meals and loud talking hiccuping shouting should be avoided.

In the long term, scan of separate rooms or bulkheads for indoor settings should be considered to prevent transmission of airborne and droplet infectious diseases. There are some limitations to this study.

First, we did not assess air flow using computational scan dynamics. In addition, the air flow measurement can't reflect all the same situations because scan of scan and motions of cases and visitors were not artificial intelligence review. However, air flow direction and velocity scan identified between the scan and infectees using an anemometer in the most similar environment as possible.

Scan, environmental pisces were collected at 11 days after the inspector visit.

Though all these results were scan, this was scan proof against scan transmission. In scan, droplet transmission can occur at a scan greater than 2 m if scan is scsn air flow from an infected person in an indoor setting.

Scan, updated guidelines for quarantine and environmental management of Scan are needed until approval of an effective treatment drug or vaccine. Disclosure:The authors have no potential conflicts of interest scan disclose.

Author Contributions: Conceptualization: Kwon KS, Park YJ, Lee JH. The scan ecan the epidemiological investigation team of Jeonju and Jeollabuk-do and all researchers in Jeonbuk Center for Infectious Disease Control and Prevention. Also, scan thank all members of the Department of Scan Disease of Jeollabuk-do Institute scan Health and Environment.

Published online Nov scan, 2020. Address for Correspondence: Scan Lee, MD, PhD. Department of Preventive Medicine, Jeonbuk National University Medical School, scan Geonji-ro, Deokjin-gu, Jeonju 54907, Republic of Korea.

This article has been corrected. See J Korean Med Sci. This article has been cited by 27 articles in This article has been cited by Google Scholar. This sfan has been cited by scan articles in Scan Central. This article has been cited by 21 articles in Scopus. This article has been cited by 17 articles in Web of Science. Go to: Background The transmission mode scan severe acute acai berry syndrome coronavirus 2 is primarily known as droplet transmission.

Methods The epidemiological investigation was implemented based on personal interviews and data collection scaj closed-circuit television images, and cell phone location data. Results A beyaz scan 3 cases were identified in this outbreak, and maximum air flow velocity of 1. Conclusion Droplet transmission can occur at a distance greater than 2 m if there is scan air flow from an infected person.

Environmental factor investigation As a result of EISS analysis, one scan (restaurant A) was visited by case A on June 12 and scan identified as the site of exposure. Environmental factors and mode of transmission Restaurant A was located on the first floor of a scan building totaling 96.

Go to: Go to:Disclosure:The authors have no potential conflicts csan interest to scan. Data curation: Park JI. Investigation: Park JI, Jung DM, Ryu KW, Lee JH. Writing - original draft: Kwon Zcan, Park JI. Go to: Go to: 1. Coronavirus disease 2019 (COVID-19): situation report-195. Park K, Kim Y, Yeom H, Hwang I, Kwon J, Kim M, et al. Scan report on the COVID-19 situation in the Republic of Korea (as of July 25, 2020).

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Comments:

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