Perspective
Possible aerosol transmission of COVID-19 associated with an outbreak in an apartment in Seoul, South Korea, 2020

https://doi.org/10.1016/j.ijid.2020.12.035Get rights and content
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Highlights

  • Scientists have strongly implied the aerosol transmission of COVID-19.

  • An outbreak occurred along two vertical lines in an apartment in South Korea.

  • The virus can be spread through the air duct by the (reverse) stack effect.

  • Aerosol transmission indoors with insufficient ventilation needs to be appreciated.

Abstract

Background

Scientists have strongly implied that aerosols could be the plausible cause of coronavirus disease-2019 (COVID-19) transmission; however, aerosol transmission remains controversial.

The study

We investigated the epidemiological relationship among infected cases on a recent cluster infection of COVID-19 in an apartment building in Seoul, South Korea. All infected cases were found along two vertical lines of the building, and each line was connected through a single air duct in the bathroom for natural ventilation. Our investigation found no other possible contact between the cases than the airborne infection through a single air duct in the bathroom. The virus from the first infected case can be spread to upstairs and downstairs through the air duct by the (reverse) stack effect, which explains the air movement in a vertical shaft.

Conclusions

This study suggests aerosol transmission, particularly indoors with insufficient ventilation, which is underappreciated.

Keywords

Aerosol
SARS-CoV-2
Coronavirus
South Korea
Ventilation
Indoor
Bathroom
Stack effect

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